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Heat Transfer Test
Study Aid for Heat Transfer Test
| Question | Answer |
|---|---|
| What heat transfer method is caused by rays or waves? | radiation |
| What heat transfer method is caused by contact? | conduction |
| What heat transfer method is caused by the flow of fluid in a liquid or gas? | convection |
| What causes wind on the Earth? | convection currents caused by the uneven heating of the Earth by the Sun |
| What color absorbs the most energy from radiation? | black |
| What color reflects the most energy from radiation? | white |
| Which heats up and cools down faster: the soil or water? | soil |
| What word describes how close together a materials molecules are? | density |
| What happens to a material's molecules when it is cooled? | They contract (move closer together and the material becomes more dense). |
| What happens to a material's molecules when it is heated? | They expand (move further apart and the material becomes less dense). |
| Why do some objects float on water? | They are less dense than the water. |
| Why do some objects sink in water? | They are more dense than the water. |
| How does the Earth's air heat up? | Radiant heat from the Sun heats the Earth materials like soil and water. The soil and water heat the air they touch by conduction. Convection currents in the air move the heated and cooled air around allowing it to heat faster. |
| What term is used to describe currents that form in fluids (liquids and gasses)? | convection currents |
| Why does cold water sink in warmer water? | It's more dense (molecules are closer together because they have less energy). |
| Why does warm water rise in cooler water? | It's less dense (molecules are further apart because they have more energy). |
| What general term is used to describe materials that can flow like liquids and gasses? | fluid |
| If a metal strip is placed in the sun, what heat transfer method will cause it to heat up? | radiation |
| If a metal strip is placed in a hot cup of water, what heat transfer method will cause it to heat up? | conduction |
| What are the convection currents that occur in the Earth's air called? | wind |
Created by:
ekeilen
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