Temperature And Heat Science

Question 1

What are the 3 methods of heat transfer?

Answer 1

Conduction
Convection
Radiation

Question 2

Conduction occurs mainly in solids liquids or gases?

Answer 2

Mainly in solids

Question 3

In what states of matter can conduction occur?

Answer 3

All states
Liquid, solid, gas

Question 4

What is conduction?

Answer 4

The transfer of heat from one molecule to another by means of direct contact.

Question 5

What is the primary method of heat conduction in pipe trades?

Answer 5

Conduction

Question 6

What is the primary cause of heat loss in a building?

Answer 6

Conduction.

Question 7

In what states of matter does convection occur?

Answer 7

Liquids and gases.

Question 8

What is convection?

Answer 8

The transfer of heat within liquids and gases through differences in densities.

Question 9

Hot water tanks use what to transfer water through baseboard heaters?

Answer 9

Convection

Question 10

What is a negative effect of convection?

Answer 10

Unwanted circulation

Question 11

What is radiation as it applies to heat transfer?

Answer 11

The transmission of heat energy through a space by means of electromagnetic infrared rays.

Question 12

At what point do inferred rays transfer their heat?

Answer 12

When they strike a substance

Question 13

When infrared rays strike a substance what kind of heat is it transformed to?

Answer 13

Sensible heat.

Question 14

What can radiant heat travel through?

Answer 14

Transparent and translucent solids liquids or gases. Just like light. And slightly warms the translucent material as it passes through.

Question 15

What is a good reflector by poor absorber of heat?

Answer 15

Light colored, shiny surfaces.

Question 16

What surfaces are excellent absorbers and emitters of heat?

Answer 16

Dark, rough surfaces

Question 17

In a hot water tank where would the liquid with the greatest density be found?

Answer 17

Bottom

Question 18

In a hot water tank the more dense water is warmer or cooler?

Answer 18

Cooler

Question 19

At what temperature is water most dense?

Answer 19

4 C
39 F

Question 20

From 4C to 100 C how much does water expand?

Answer 20

5%

Question 21

How much does water expand when it vaporizes?

Answer 21

About 1700 times

Question 22

When cooled lower than 4c does water contract or expand?

Answer 22

Expands

Question 23

When turned to ice how much does water expand by?

Answer 23

7.5%

Question 24

What is the formulae for rate of expansion?

Answer 24

Length X Delta T (temperature change) X coefficient of expansion

Question 25

Insulation on piping helps prevent what type of heat transfer?

Answer 25

Heat loss due to conduction