Question

What is the definition of Convection?

Question 1 options:

When heat transfers through waves.


A hot liquid or air that expands, becomes less dense, and rises or becomes more dense and sinks.


When heat transfers from objects that are touching


Heat traveling from the sun.


What kind of heat transfer happens when the sun is heating your body?

Question 2 options:

Conduction


Convection


Radiation


Density


Which of the following is an example of convection?

Question 3 options:

A hair dryer drying your hair.


When a car engine turns hot after being turned on.


When the AC or heater changes the temperature


When you are making soup and the water is rising and lowering.


Walking on the warm sand with your bare feet demonstrates this type of heat transfer.

Question 4 options:

conduction


radiation


convection

What heat transfer happnes when you burn your hand by touching a fire.

Question 5 options:

Radiation


Conduction


What heat transfer happnes when you burn your hand by touching a fire.

Question 5 options:

Radiation


Conduction


Convection

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

Question 6 options:

Conduction


radiation


convection

Answer 1

Step-by-step explanation:

1. Heat transfers through objects it is touching

2. Radiation

3. The one about the car engine

4. Convection

5. Radiation

6. Conduction

Answer 2

1. A hot liquid or air that expands, becomes less dense, and rises or becomes more dense and sinks.

2. Radiation

3. When you are making soup and the water is rising and lowering.

4. conduction

5. Conduction

6. convection

Step-by-step explanation:

1. Convection is one of the three methods of heat transfer involving the transfer of heat by the rise and fall of a fluid (liquid and gas) caused by difference in temperature. Based on this, a hot liquid or air that expands, becomes less dense, and rises or becomes more dense and sinks is a perfect definition of convection.

2. Another method of heat transfer called RADIATION involves the transfer of heat between surfaces without a contact between them. The sun heating the human body represents an example of radiation because there is no direct contact between the heat source (sun) and the heated surface (human body).

3. Making soup and the water is rising and lowering is an example of convection because it involves the rising and lowering of a liquid (soup) due to a temperature gradient.

4. Conduction is a method of heat transfer that involves the transfer of heat through a solid medium in direct contact with one another. The solid material is called the CONDUCTOR. The transfer of heat from a warm sand to the bare feet, acting as the conductor is an example of CONDUCTION.

5. Heat is transferred when one touches a fire. This represents CONDUCTION because the fire transfers the heat via a solid medium (hand) in contact with it.

6. The warm air near a room rises because there is transfer of heat, caused by a difference in temperature, through the fluid (gas) causing it to become more dense and rise.