Chapter 3 Section 2

Question 1

Heat always moves from __________ substance to ____________ substance.

Answer 1

from warmer to cooler

Question 2

What are the three types of heat transfers?

Answer 2

radiation, conduction, and convection

Question 3

The transfer of energy through space.

Answer 3

radiation

Question 4

Heat transfer within a material or between materials that are touching.

Answer 4

conduction

Question 5

Heat transfer by the movement of fluids–liquids and gases.

Answer 5

convection

Question 6

This type of heat transfer takes place with no direct contact between a heat source and an object.

Answer 6

radiation

Question 7

This type of heat transfer is when you feel heat around a flame or open fire.

Answer 7

radiation

Question 8

An example of this type of heat transfer is: a spoon in a pot of soup heats up. Heat moves from the hot soup and the pot to the particles that make up the spoon. The particles near the bottom of the spoon vibrate faster as they are heated, so they bump into other particles and heat them too.

Answer 8

conduction

Question 9

During this type of heat transfer, heated particles of fluid begin to flow. This flow transfers heat from one part of the fluid to another.

Answer 9

convection

Question 10

A measure of how much mass there is in a volume of a substance.

Answer 10

density

Question 11

When a liquid is heated up, the particles move faster and spread apart. As a result, the particles of the heated fluid occupy more space and the fluid’s density ________________.

Answer 11

decreases

Question 12

As a fluid cools, the particles move more slowly and settle together more closely, therefore the density _____________.

Answer 12

increases

Question 13

Heat transfer by _______________ is caused by differences of temperature and density within a fluid.

Answer 13

convection

Question 14

The flow that transfers heat within a fluid.

Answer 14

convection current

Question 15

As a liquid cools and becomes more dense, the fluid sinks to the bottom of the pot and the warmer, less dense liquid rises. This is known as:

Answer 15

convection current

Question 16

In the Earth’s mantle, large amounts of heat are transferred by _______________.

Answer 16

convection currents

Question 17

Heating and cooling of a fluid changes, changes in the fluid’s density, and the force of gravity combine to create _____________.

Answer 17

convection currents

Question 18

What happens to the density of a fluid as it becomes hotter?

Answer 18

it decreases

Question 19

What happens to the density of a fluid as it becomes cooler?

Answer 19

it increases

Question 20

Name two layers of Earth in which convection currents take place.

Answer 20

mantle and core

Question 21

What do convection currents in the outer core cause?

Answer 21

Earth’s magnetic field