HT.2.d Conduction, convection, radiation

Choose the true statements. (Select all that apply)

• The human body does not feel temperature, it feels how fast heat enters or leaves the body.

• The Earth is warmed by the sun's thermal energy

• Windchill makes the temperature go down.

• The air temperature under a tree is lower than out in the sun, just beside it.

Select the major types of heat transfer

• Convection

• Conduction

• Radiation

• Phase Change

Conduction is when heat is transferred...

• by particles moving from place to place, vibrating but also taking their kinetic energy with them

• by particles vibrating next to each other, passing along their kinetic energy

• through a vacuum (empty space) in the form of waves, which then hits particles and transfers the radiant energy into kinetic energy

• by releasing or absorbing thermal energy when bonds are strengthened or weakened between particles

Convection is when heat is transferred...

• by particles moving from place to place, vibrating but also taking their kinetic energy with them

• by particles vibrating next to each other, passing along their kinetic energy

• through a vacuum (empty space) in the form of waves, which then hits particles and transfers the radiant energy into kinetic energy

• by releasing or absorbing thermal energy when bonds are strengthened or weakened between particles

Radiation is when energy is transferred...

• by particles moving from place to place, vibrating but also taking their kinetic energy with them

• by particles vibrating next to each other, passing along their kinetic energy

• through a vacuum (empty space) in the form of waves, which then hits particles and transfers the radiant energy into kinetic energy

• by releasing or absorbing thermal energy when bonds are strengthened or weakened between particles

Phase change is when heat is transferred...

• by particles moving from place to place, vibrating but also taking their kinetic energy with them

• by particles vibrating next to each other, passing along their kinetic energy

• through a vacuum (empty space) in the form of waves, which then hits particles and transfers the radiant energy into kinetic energy

• by releasing or absorbing thermal energy when bonds are strengthened or weakened between particles

Choose the true statements. (Select all that apply)

• Using a fan when the air temperature is greater than your body temperature will cool you down.

• Turning on a fan when the air temperature is above your skin temperature can cool you down.

• Sweating cools down the body even when the air temperature is greater than your body temperature.

• Sweating is more effective when there is less moisture in the air.

Windchill is...

• wind lowering the temperature of the air, making it colder outside.

• wind using convection to take heat away from your body quicker, to make it feel like a lower temperature.

• wind using conduction to take heat away from your body quicker, to make it feel like a lower temperature.

• wind increasing the kinetic energy of the air particles, making it feel like a warmer temperature.

Which condition would best transfer heat by conduction.

• Stationary gas particles

• Stationary liquid particles

• Solid particles

• Vacuum (no particles)

Which condition would be the worst to transfer heat by conduction.

• Stationary gas particles

• Stationary liquid particles

• Solid particles

• Vacuum (no particles)