Heat Transfer (1/29)

Question 1

What is heat?

Answer 1

energy

Question 2

What are the two main types of energy?

Answer 2

kinetic energy and thermal energy

Question 3

What is kinetic energy?

Answer 3

movement of molecules so that when they bump into each other, energy is converted from one form to another

Question 4

What is thermal energy?

Answer 4

energy as heat

Question 5

What is the measurement of thermal energy?

Answer 5

temperature

Question 6

What type of energy do we use to cook food?

Answer 6

thermal energy

Question 7

What does cooking food do?

Answer 7

improves food safety, extends shelf life, makes foods edible, improves digestibility, and can enhance sensory properties

Question 8

What is sensible heat?

Answer 8

heat you can feel/measure

Question 9

The physical state of matter changes as a result of what?

Answer 9

energy in the form of heat, such as solid (ice), liquid (water), and gas (steam)

Question 10

What creates vapor pressure?

Answer 10

gaseous molecules hovering over water

Question 11

What forms in a liquid as the vapor pressure is increased to a point greater than the atmospheric pressure

Answer 11

bubbles

Question 12

What interacts with cooking?

Answer 12

outside pressure

Question 13

When does water boil?

Answer 13

at sea level at 212 F and at lower temps at higher elevations

Question 14

What is heat capacity?

Answer 14

how much energy it takes to heat things by a specific temperature change

Question 15

What is the heat capacity for water?

Answer 15

1 cal/g C

Question 16

What is latent heat?

Answer 16

heat required to change state without changing temperature

Question 17

What do you have to add to cause a change in state?

Answer 17

energy

Question 18

What needs more energy ice to change to liquid water or water to change to steam?

Answer 18

water to steam (540 calories)

Question 19

What are the different techniques used to transfer heat to food for cooking?

Answer 19

conduction, convection, radiation, and induction

Question 20

What is conduction?

Answer 20

direct contact: frying pan on a stove top

Question 21

What is convection?

Answer 21

currents in the air or liquid distributive the heat

Question 22

What is radiation?

Answer 22

energy transferred as waves or rays vibrating at a high frequency

Question 23

What is induction?

Answer 23

magnetic current generated by a high-frequency induction coil

Question 24

What happens when liquid and gases are heated?

Answer 24

they become lighter (less dense) and rise, whereas cooler molecules of the liquid or gas move to the bottom of a container or closed compartment

Question 25

What are good conductors?

Answer 25

copper, aluminum, iron

Question 26

What does not conduct heat evenly?

Answer 26

stainless steel

Question 27

What absorbs radiant heat?

Answer 27

dull, dark, rough surfaces

Question 28

What reflects radiant heat?

Answer 28

bright, shiny, smooth surfaces

Question 29

What is needed in induction?

Answer 29

iron content

Question 30

What do you need to transfer heat?

Answer 30

media

Question 31

What does the media define?

Answer 31

the type of cooking

Question 32

What are different types of media?

Answer 32

air, water, steam, fat

Question 33

What are different cooking methods?

Answer 33

moist heat, dry heat, and combination