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In relation to lipids explain each of the following: Smoke point _______________________________________ Flash point _______________________________________ - Leaving Cert Home Economics - Question 4 - 2015
Question 4
In relation to lipids explain each of the following: Smoke point _______________________________________ Flash point _______________________________________
Worked Solution & Example Answer:In relation to lipids explain each of the following: Smoke point _______________________________________ Flash point _______________________________________ - Leaving Cert Home Economics - Question 4 - 2015
Step 1
Smoke point
Answer
The smoke point of lipids refers to the temperature at which they begin to decompose, resulting in the production of smoke. At this point, lipids start breaking down into glycerol and free fatty acids. As the temperature increases beyond the smoke point, a blue haze may become visible, indicating the presence of an acrid-smelling compound known as acrolein. For instance, various fats have different smoke points, with some fats reaching 200°C and oils at about 250°C.
Step 2
Flash point
Answer
The flash point of lipids is the temperature at which they can spontaneously ignite and burst into flames. This occurs as the energy provided by heat causes volatile compounds to evaporate and ignite with an open flame. For example, fats may have a flash point around 310°C, while oils typically reach their flash point at about 325°C. Beyond the flash point, the decomposition of lipids continues, potentially leading to hazardous situations.