Heat Transfer

Radiation can be....

• Roasting over a fire.

• Oven cooking a pizza.

• Microwaving a popcorn bag.

• Energy from a light source.

Convection can be....

• Hot air rising.

• Boiling water.

• Steam rising from a teapot.

• Hot air balloons.

Conduction or radiation can be....

• Cooking pancakes.

• A turtle on a beach.

• Touching hot food.

• A metal spoon in hot soup.

To move something, heat moves to a place where the temperatures are cooler...

• thermometer

• transfer

• insulator

• transfer

Holding hands is....

• radiation

• conduction

• convection

• conductor

Energy of motion is....

• kinetic energy

• convection

• thermal energy

• conduction

When heat is applied to a material, its ________ move faster and its state can change from solid to liquid or liquid to gas. When that same material is cooled, its molecules slow down. In this case the reverse happens, and its state can change from gas to liquid or from liquid to solid.

• atoms.

• energies

• molecules

• air

What causes these hot water springs to explode with such force? The water underground is usually constricted in some way, trapping it near hot magma under Earth's surface. This allows the water to become superheated, even past its normal boiling point. As the water rises toward the surface, steam forms. At the tipping point, the geyser overflows and breaks the surface, resulting in a huge amount of liquid water and ____________being forced out of the vent

• gaseous steam

• sewage material

• wastes

• foam

When air comes into contact with heated water or land, the air gets warm through conduction. The warm air particles gain thermal energy and move faster and farther apart, causing the air to become less _________: closely compacted or set together

. This means that the warm air rises into the atmosphere. At the same time, air in the upper atmosphere cools, causing it to sink back toward Earth.

• dense

• airy

• foamy

• cold

Radiant energy from the sun is an essential ingredient in photosynthesis, which is how plants make food. Also, plants turn carbon dioxide into oxygen. Without the sun, plants could not_____________

• sunbathe.

• Change colors

• grow.

• breathe.