Convection Heat

The diagram shows a refrigerator. The cooling unit is placed at the top. The cooling unit cools the air near it. What happens to the density of the air as it cools, and how does it move?

• The density of air increases. It moves down.

• The density of air increases. It moves up.

• The density of air decreases. It moves down.

• The density of air increases. It moves up.

Tags

NGSS.MS-PS1-4

The diagram shows some rice being boiled in a pan. What is the main methods by which thermal energy is transferred (i) through the metal pan and

(ii) through the water?

• (i) conduction (ii) conduction

• (i) convection (ii) convection

• (i) conduction (ii) convection

• (i) convection (ii) conduction

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

In the process of convection, energy is transferred _________.

• because of temperature differences in a solid

• because of density differences in a liquid

• by the diffusion of molecules throughout a fluid

• by the vibration of molecules

Tags

NGSS.MS-PS1-4

You are baking a cake. When you open the oven, a gush of warm air flows out toward your face. This warm air is due to???

• conduction

• convection

• radiation

Near the ceiling of a room the air is warmer. The warm air rises because of???

• conduction

• convection

• radiation

Tags

NGSS.MS-PS1-4

Which type of heat is being transferred in the image?

• Conduction

• Convection

• Radiation

Tags

NGSS.MS-PS3-3

Liam is cooking pasta. He starts with just a pot of hot water then he adds the cold pasta how does the pasta get cooked?

• conduction

• radiation

• convection

• conduction and convection

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

___________________ is the type of heat transfer that occurs in fluids, such as warm air rising and cold air sinking; creating wind.

• Convection

• Conduction

• Radiation

• insulation.

Tags

NGSS.MS-ESS2-6

Which of the following is a primary characteristic of convection heat transfer?

• It occurs in solids due to molecular vibration

• It involves the movement of fluid masses

• It is the transfer of heat through electromagnetic waves

• It requires direct contact between surfaces

In a pot of boiling water, how is heat primarily transferred from the bottom to the top of the pot?

• Conduction

• Convection

• Radiation

• Insulation