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

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 2.01--Physical Change

Why study physical changes? Physical changes are crucial in: Product development Process design Shelf life A 2.01--Physical Change

Physical changes to matter Physical changes to matter involve: Changing shape/size – crushing ice Changing temperature – boiling ice Changing phase – melting ice A 2.01--Physical Change

Changing its Shape or Size Chopping Slicing Mashing Grinding A 2.01--Physical Change

Changing the Temperature Change the temperature of matter without changing its chemical identity – heating and cooling. Examples include pasteurization and rapid cooling. A 2.01--Physical Change

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 2.01--Physical Change

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 2.01--Physical Change