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1

what is energy?

ability to do work

2

what does food scientists examine? what does it help?

how heat is transferred during cooking and preservation and how energy affects the structure of food during such processes. --help develop new food products to meet the needs of consumers

3

how can energy be describe?

stored or motion

4

what is potential energy?

stored energy. e.g. work done in lifting objects to a position. in food, it is in the form of chemical potential energy called calories.

5

what is kinetic energy?

the energy of motion. the faster an object moves, the more kinetic energy it has.

6

what energy does atoms and molecules always have?

kinetic energy, because they are always in motion.

7

how does energy constantly change?

from potential to kinetic energy and back again.

8

how can Potential and kinetic energy be described?

as external or internal.

9

what is external energy?

Energy applied to an object by another source

10

what is internal energy?

Energy within an object

11

what does food contain?

internal potential energy--fuel for the body is stored in every piece of food.

12

what is energy's property?

versatile多用途的 and can change from one form to another.

13

what forms of energy are used by the food industry?

all forms. mechanical, chemical, electrical, nuclear, radiant.

14

what is mechanical energy?

total kinetic and potential energy of a system.

15

what is mechanical energy used by?

the body whenever it moves. equipment during food processing.

16

what energy does mixers, blenders and food processors convert to?

electrical energy to mechanical energy.-- performs work on food.

17

when is chemical energy generate?

bonds between atoms are forms or broken during chemical reactions.

18

what does endothermic reaction do?

absorbs or stores energy and lowers the temperature

19

what does exothermic reaction do?

releases energy and increases the temperature

20

what does metabolism do?

allow body to utilize chemical energy from food.

21

how does electrical energy produce?

movement of e-

22

what can electrical energy do?

efficiently converted into mechanical or radiant energy for food processing. transported through materials that are good conductors such copper, silver, and certain metals.

23

what is radiant energy?

energy transmitted in the form of waves through space or some medium.--electromagnetic spectrum is another term.

24

what will it call when visible?

light

25

when radiant energy is used?

cooking appliances and outdoor grills.

26

what energy does microwave change?

convert electrical energy to radiant energy. the electron tube converts electrical energy into microwaves

27

what is magnetron?

the electron tube.

28

what is microwaves?

low-frequency electromagnetic waves of radiant energy

29

how does microwave work?

interior surfaces reflect microwaves toward the food.

30

what does induction cooktops use electromagnetic waves do?

generate heat during cooking.--special pans with metals that react to a magnetic field produce the electric current needed to cook food