1. Food is matter-A pure substance or mixture
Physical Changes
Food is matter-A pure substance or mixture

2. Physical properties
Thermodynamics -- effect of change in temperature, pressure, and volume (canning)
Heat transfer -- the passage of thermal energy from a hot to a cold body (cooking and cooling)
Microwave -- passing microwave radiation through food and water, fat, and sugar so they absorb energy (cooking)
Texture
Appearance
A Physical Change

3. Why study physical changes?
Physical changes are crucial in:
Product development
Process design
Shelf life
A Physical Change

4. Physical changes to matter
Physical changes to matter involve:
Changing shape/size – crushing ice
Changing temperature – boiling ice
Changing phase – melting ice
A Physical Change

5. Changing its Shape or Size
Chopping
Slicing
Mashing
Grinding
A Physical Change

6. Changing the Temperature
Change the temperature of matter without changing its chemical identity – heating and cooling.
Examples include pasteurization and rapid cooling.
A Physical Change

7. Changing Phase: Three states of matter are:
Solid -- ice
Liquid -- water
Gas – steam
Physical change in the state of matter that does not change the molecular structure.
A Physical Change

8. Changing Its Phase
Phase is a physical change in state of matter that does not change the molecular structure.
The three states of matter – solid, liquid, and gas.
A Physical Change