Teacher background information

   

Year 5 Science Content Description

Science Understanding

Chemical sciences

Solids, liquids and gases have different observable properties and behave in different ways (ACSSU077 - Scootle )

  • recognising Aboriginal and Torres Strait Islander People’s knowledge and understanding of solids, liquids and gases (OI.5)

This elaboration provides students with the opportunity to recognise Aboriginal and Torres Strait Islander Peoples’ knowledge and understanding of changes in states of matter. Aboriginal and Torres Strait Islander Peoples have worked, and continue to work, with materials that have the chemical propensity for changing state. The scientific knowledge of applying or removing heat to produce changes in states of matter is evidenced in many long-held and ongoing Aboriginal and Torres Strait Islander practices, including the extraction of oils (solid-liquid), medicinal therapies (liquid-gas) and cooking practices (liquid-gas). Students will have the opportunity to understand how Aboriginal and Torres Strait Islander Peoples’ knowledge about states of matter is used in many processes and practices.

Aboriginal and Torres Strait Islander Peoples have long demonstrated an understanding of the scientific principle that matter comes in the form of solids, liquids and gasses and that these various states of matter have different properties. The application or removal of heat is related to changes in states of matter and Aboriginal and Torres Strait Islander Peoples have long used temperature to change the state of matter of a substance for a desired purpose. The application or removal of heat is employed in many different circumstances, including the preparation of foods and medicines, to obtain a desired state of matter or utilise its observable properties. 

Aboriginal and Torres Strait Islander Peoples have knowledge about which plant species contain important therapeutic oils and how to extract the oil. Some plant oils are highly volatile and can be vaporised at temperatures below the boiling point of the oil. The controlled application of heat to such plant material results in the therapeutic compound being released in the vapour (steam).

Prior to colonisation, the Wiradjuri People of central New South Wales treated colds by building steam pits that were heated by fires, lined with Eucalyptus spp. leaves and overlaid with possum-rugs. The Eucalyptus spp. oil is vaporised through this process and inhaled as a decongestant treatment for coughs and colds. Melaleuca spp. (tea tree) is a plant that also contains important medicinal oils. The Yaegl Peoples of the Coffs Harbour region of New South Wales heat tea tree leaves to release the oil in the vapour to treat respiratory conditions by inhalation. Products containing Eucalyptus spp. or Melaleuca spp. oil continue to be used in this manner today for the treatment of colds and respiratory conditions. The Anindilyakwa Peoples of Groote Eylandt and Bickerton Island in the Gulf of Carpentaria boiled the fresh leaves of a species of Calytrix and inhaled the vapours to unblock the sinuses and clear head colds. The Ngarrindjeri Peoples of the Murray River region in South Australia developed a sauna-like therapy utilising the steam released from wet plant material.

Many Aboriginal Peoples also use heat from fires to vaporise plant oils from foliage, bark and wood, to use as insect repellent. The Ngarrindjeri Peoples in South Australia use the green foliage of the daisy-bush for this purpose, while the Gugadja Peoples of the Western Desert use the conkerberry bush to repel insects. Steam from heating water or from fires is also useful in making wood more pliable and is used in the manufacture of canoes and wooden implements such as spears. The Warnindhilyagwa Peoples of Groote Eylandt use steam and fire to cure wood to complete the construction of dugout canoes.  

Aboriginal and Torres Strait Islander Peoples also applied heat to liquefy fats into oils, a process known as rendering. The application of heat to the fat of an animal results in a change of state from solid to liquid. Rendered oils have many useful properties, making the process of liquefying fats an important practice and the extracted oils highly valuable. On the western Cape York Peninsula, the Anguthimri and the Awngthim Peoples rendered stingray fat by heating it in a large bailer shell. The liquid oil has long been used as a treatment in the manufacture and repair of wooden implements such as the spear-thrower. In the Torres Strait, the Mabuygiwgal People of Mabuaig Island today continue the long-held practice of boiling the fat of turtles, liquefying the solid turtle fat into oil, and collecting and storing the resulting oil. Similarly, the Quandamooka Peoples of Minjerribah (North Stradbroke Island) in Queensland boil down the fat of the dugong to a liquid state and use the oil medicinally to treat ailments such as colds, aches and pains. 

Aboriginal and Torres Strait Islander Peoples used the technique of cold-pressing to release oils from nuts. This process uses heat generated through friction to extract a liquid oil from a solid seed or nut. Prior to colonisation, the Miriam People of Mer Island in the Torres Strait extracted coconut oil through a process of scraping and straining. Candlenut oil was extracted by the Dingaal People of the Cape York Peninsula region and has long been used as a fixative for pigments on wooden implements. In the southwest of Western Australia, the Wiilman Peoples of the Noongar Nation pounded the seeds of sandalwood into oil for rubbing onto skin. The application of heat by Aboriginal and Torres Strait Islander Peoples to change solid animal fats into liquid oils demonstrates the long-held understanding of the properties of solids and liquids.

Other means of preparing and cooking food also utilised heat to change water into steam. Aboriginal and Torres Strait Islander Peoples understand that all foods contain water and the application of heat to food changes the state of water from liquid into gas. This knowledge is applied by Aboriginal and Torres Strait Islander Peoples in the preparation and preservation of food. For millennia, food has often been cooked through a process of steaming, either in ground ovens or by wrapping food in leaves to retain the moisture when cooking. Such processes demonstrate Aboriginal and Torres Strait Islander Peoples’ understanding that the water within the food will evaporate into gas when heated. This steam remains within the oven or wrapping to provide moisture in the cooking process.

Over millennia, the Barindji Peoples of south central New South Wales have cooked large animals in a ground oven into which hot stones were placed. The animal was then placed into the oven, covered with grass, more hot stones placed on top, and completely enclosed with earth. At various cooking intervals a hole was made in the oven and water was poured in to steam the food. The addition of water to the oven demonstrates the knowledge that the steaming process requires water, as a liquid to generate steam for cooking. The Bindal and Wulgurukaba Peoples of far North Queensland also cooked meats in dug out ovens using hot stones and covering the entire ground oven with earth. If an opening was noticed it was immediately covered to keep the steam trapped and the heat and moisture within. The Luritja People of the Central Desert use a species of Zygophyllum as a source of moisture to generate steam for cooking cress and other plant foods. To cook plants, the Zygophullum sp. is placed on hot rocks in the sand with the plants to be cooked sandwiched between another layer of Zygophullum sp. More hot stones are placed on top and the whole oven covered with wet sand. When the surface of the sand cracks the plants are recovered for consumption and the Zygophullum sp. is discarded. Alternatively, food may be wrapped in leaves, such as banana leaves or leaves of native ginger, or moistened paperbark, to steam on hot coals or ash. This ensures that the water content from the food remains contained during the cooking process, and that the steam is not lost to the atmosphere.

Aboriginal and Torres Strait Islander Peoples also use the knowledge of water evaporation to preserve foods. Prior to colonisation, the Mabuygiwgal Peoples of Mabuaig Island in the Torres Strait prepared strips of dugong in the dry season by dehydrating the meat in the sun. Cooked strips of turtle meat were elevated on sticks so that the heat of the sun could remove the water content through evaporation and preserve the meat. This supply of preserved food was then available in the north-west monsoon season or while travelling. The Gunditjmara Peoples of south west Victoria preserved eels and fish by smoking them in special hollowed out trees. This process uses heat from a fire set underneath hanging fish to evaporate water from the fish, to preserve them for trade or storage. In Central Australia, the Pitta Pitta Peoples desiccated (removed all water from) pituri, a narcotic sourced from the plant Dubosia hopwoodii. This was done by hanging the tops of the plant to dry in the heat of the sun, sweating the leaves beneath a layer of fine sand, and powdering the dried leaves in preparation for transport. Such long and enduring practices demonstrate how Aboriginal and Torres Strait Islander Peoples have used knowledge of states of matter to evaporate water from food and other resources.

This elaboration provides the opportunity for students to understand changes in state of matter through Aboriginal and Torres Strait Islander contexts. Aboriginal and Torres Strait Islander Peoples have long used temperature to change the state of a particular material for a desired purpose or to exploit the observable properties of matter. This elaboration provides students with the opportunity to learn how Aboriginal and Torres Strait Islander Peoples have long used, and continue to use, heat to change state for medicinal purposes, insect repellents, the preparation and preservation of food resources, and engineering wooden vessels and implements.

In the construction of this teacher background information, a list of consulted works has been generated. The consulted works are provided as evidence of the research undertaken to inform the development of the teacher background information. To access this information, please read and acknowledge the following important information:

Please note that some of the sources listed in the consulted works may contain material that is considered culturally offensive or inappropriate. The consulted works are not provided or recommended as classroom resources.

I have read and confirm my awareness that the consulted works may contain offensive material and are not provided or recommended by ACARA as classroom resources.


The following sources were consulted in the construction of this teacher background information. They are provided as evidence of the research undertaken to inform the development of the teacher background information. It is important that educators recognise that despite written records being incredibly useful, they can also be problematic as they are often based on non-Indigenous interpretations of observations and records of First Nations Peoples’ behaviours, actions, comments and traditions. Such interpretations privilege western paradigms of non-First Nations authors and include, at times, attitudes and language of the past. These sources often lack the viewpoints of the people they discuss and can contain ideas based on outdated scientific theories. Furthermore, although the sources are in the public domain, they may contain cultural breaches and cause offence to the Peoples concerned. With careful selection, evaluation and community consultation, the consulted works may provide teachers with further support and reference materials that could be culturally audited, refined and adapted to construct culturally appropriate teaching and learning materials. The ability to select and evaluate appropriate resources is an essential cultural capability skill for educators.

ABC News. (2018, September 16). Article on the uses and interest in dugong oil (Ipswich Herald, 1908). Retrieved from https://www.abc.net.au/news/2018-09-16/dugong-article/10251268

Anderson, C. (1996). Traditional material culture of the Kuku-Yalanji of Bloomfield River, north Queensland. Records of the South Australian Museum, 29(1), 63-83.

Baldwin, R. A., Singh, R. P., & Formo, M. W. (2019). Fat and oil processing. Retrieved from https://www.britannica.com/science/fat-processing#ref501278

Braithwaite, M., Vuuren, V. S. F., & Viljoen, A. M. (2008). Validation of smoke inhalation therapy to treat microbial infections. Journal of Ethnopharmacology,119, 501-506.

Builth, H., Kershaw, A. P., White, C., Roach, A., Hartney, L., Mckenzie, M., … Jacobsen, G. (2008). Environmental and cultural change on the Mt Eccles lava-flow landscapes of southwest Victoria, Australia. The Holocene, 18(3), 413-424. https://doi.org/10.1177/0959683607087931

Clarke, P. A. (2018). Animal food. In F. Cahir, I. D. Clark, P. A. Clarke (Eds.), Aboriginal biocultural knowledge in south-eastern Australia: Perspectives of early colonists. Clayton, Victoria: CSIRO Publishing.

Cane, S. (1987). Australian Aboriginal subsistence in the Western Desert. Human Ecology,15(4), 391-434.

Cawte, J. (1996). Healers of Arnhem Land. Sydney: University of New South Wales Press.

Clarke, P. A. (2011). Aboriginal People and their plants (2nd ed.). Kenthurst, New South Wales: Rosenberg Publishing.

Cleland, J. B., & Johnston, T. H. (1933). The ecology of the Aborigines of Central Australia. Transactions of the Royal Society of South Australia, 57, 113-124.

Dugong Oil. (1861, August 23). Ipswich Herald and General Advertiser, p. 4. Retrieved from http://nla.gov.au/nla.news-article109910663

Dyson, L. E. (2006). Indigenous Australian cookery, past and present. Journal of Australian Studies, 30(87), 5-18. https://doi.org/10.1080/14443050609388047

Folkmanova, V. (2015). The oil of the dugong: Towards a history of an Indigenous medicine. History Australia, 12(3), 97-112. https://doi.org/10.1080/14490854.2015.11668588

Goanna. (n.d.). Goanna history. Retrieved from http://www.grabthegoanna.com.au/about#history

Gunditj Mirring Traditional Owners Aboriginal Corporation. (2013). Cultural features of the Budj Bim landscape: Smoking trees. Retrieved from https://docs.wixstatic.com/ugd/b5965f_825b198cbd8c41a29eab30cbf49bd6d2.pdf

Haddon, A. C. (1912). Reports of the Cambridge Anthropological Expedition to Torres Straits. Volume IV, Arts and crafts. Cambridge: Cambridge University Press.

Hale, H. M. & Tindale, N. B. (1934). Aborigines of Princess Charlotte Bay, North Queensland. Records of the South Australian Museum, 5(1), 63-172.

Hassell, E., & Davidson, D. (1936). Notes on the ethnology of the Wheelman Tribe of southwestern Australia. Anthropos, 31(5), 679-711. Retrieved from http://search.proquest.com/docview/1298739298/

Higgin, J. A. (1903). An analysis of the ash of Acacia salicina. Transactions of the Royal Society of South Australia, 27, 202-204.

Keogh, L. (2011). Duboisia pituri: A natural history? Historical Records of Australian Science, 22(2), 199-214. https://doi.org/10.1071/HR11008

Khan, K. (2003). Catalogue of the Roth Collection of Aboriginal artefacts from north Queensland (Vol. 3). Items collected from McDonnell Electric Telegraph Office, McIvor River, Mapoon and the Pennefather and Wenlock Rivers, Maytown, Mentana, Mitchell River, Morehead River, Moreton Electric Telegraph Office and Musgrave, in 1897–1903. Technical Reports of the Australian Museum, 17, 1-106. https://doi.org/10.3853/j.1031-8062.17.2003.1371

Lumholtz, C. (1889). Among cannibals: An account of four years' travels in Australia and of camp life with the Aborigines of Queensland. London: J. Murray.

Macquarie University. (n.d.). Customary medicinal knowledgebase. Retrieved from http://biolinfo.org/cmkb_dev/cmkb/web/

McConnel, U. (1953). Native arts and industries on the Archer, Kendall and Holroyd Rivers, Cape York Peninsula, North Queensland. Adelaide: The Hassell Press.

Nugent, S. (2015). Sticks and stones: A functional analysis of Aboriginal spears from Northern Australia. [Doctoral Thesis]. The University of Queensland, School of Social Science.

Packer, J., Brouwer, N., Harrington, D., Gaikwad, J., Heron, R., Yaegl Community Elders, … Jamie, J. (2012). An ethnobotanical study of medicinal plants used by the Yaegl Aboriginal community in northern New South Wales, Australia. Journal of Ethnopharmacology, 139(1), 244-255. https://doi.org/10.1016/j.jep.2011.11.008

Roth, W. E. (1901). Food: Its search, capture, and preparation. (North Queensland Ethnography Bulletin No. 3). Brisbane: Government Printer.

Roth, W. E. (1904). Domestic implements, arts, and manufactures. (North Queensland Ethnography Bulletin No. 7). Brisbane: Government Printer.

Sadgrove, N., & Jones, G. (2015). A contemporary introduction to essential oils: Chemistry, bioactivity and prospects for Australian agriculture. Agriculture, 5(1), 48-102. https://doi.org/10.3390/agriculture5010048

Sadgrove, N., & Jones, G. L. (2013). A possible role of partially pyrolysed essential oils in Australian Aboriginal traditional ceremonial and medicinal smoking applications of Eremophila longifolia (R. Br.) F. Muell (Scrophulariaceae). Journal of Ethnopharmacology, 147(3), 638-644.

Sadgrove, N., Jones, G. L., & Greatrex, B. W. (2014). Isolation and characterisation of (−)-genifuranal: The principal antimicrobial component in traditional smoking applications of Eremophila longifolia (Scrophulariaceae) by Australian Aboriginal Peoples. Journal of Ethnopharmacology, 154(3), 758-766.

Smith, N. M. (1991). Ethnobotanical field notes from the Northern Territory, Australia. Journal of the Adelaide Botanic Garden, 14(1), 1-65.

Smyth, R. B. (2010). Aborigines of Victoria: With notes relating to the habits of the natives of other parts of Australia and Tasmania compiled from various sources for the Government of Victoria. Cambridge: Cambridge University Press. https://doi.org/10.1017/CBO9780511695230

Walking Tours of Melbourne. (2015). Aboriginal plants for food, tools and medicine in Melbourne. Retrieved from http://melbournewalks.com.au/aboriginal-food-plants/ 

Webb, C. (2014). Insect repellents derived from Australian plants and implications for public health messages. In M. Debboun, S. P. Frances, & D. Strickman (Eds.), Insect repellents handbook (2nd ed.). London: CRC Press. https://doi.org/10.1201/b17407

Williams, C. (2013). Medicinal plants in Australia: Vol. 4. An antipodean apothecary. Dural: Rosenberg Publishing.