1. Preservation of Food

2. Airless Environment Packaging
Why do we remove the air from canned food?
Why must you not purchase dented cans?

3. Chemical Preservation
Why are some foods suspended in alcohol or vinegar? Why is this effective?

4. Chemical Preservation
This meat has not been cooked so how might it have been preserved?

5. Heat Treatment
Milk is commonly preserved using an age old technique – what is it called?
Why is this technique successful?

6. Suspended Decomposition
You commonly freeze food at home regularly in order to preserve it – why does this work?
What problems are associated with thawed food and why can you only ever freeze food once?

7. Why bother?
What is the common element with the previous questions? What is it that we are trying outwit in order to preserve our food?