Convection and Convection Currents

What is convection?

• Transfer of heat through the movement of a fluid

• Transfer of heat through conduction

• Transfer of heat through radiation

• Transfer of heat through the movement of a solid

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What are the three factors that affect convection?

• heat capacity, thermal conductivity, and surface area

• temperature difference, fluid velocity, and fluid properties

• humidity, wind speed, and altitude

• density, viscosity, and pressure

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Explain how temperature difference affects convection.

• Temperature difference has no effect on convection.

• Temperature difference causes the fluid or gas to evaporate.

• Temperature difference creates a density difference in the fluid or gas, causing warmer fluid or gas to rise and cooler fluid or gas to sink, resulting in convection.

• Temperature difference causes the fluid or gas to become stagnant.

Tags

NGSS.MS-PS3-4

How does the density of a fluid affect convection?

• The density of a fluid affects convection by determining the temperature difference.

• The density of a fluid affects convection by determining the buoyancy force.

• The density of a fluid affects convection by determining the viscosity.

• The density of a fluid has no effect on convection.

Tags

NGSS.MS-PS1-4

What is the role of gravity in convection?

• Gravity has no role in convection.

• Gravity only affects solids in convection.

• Gravity causes convection to stop.

• Gravity causes fluids to circulate in convection.

Give an example of natural convection.

• Cooling of a cup of hot coffee

• Melting of ice in a glass of water

• Burning of a candle

• Rising of hot air and sinking of cold air in a room

What are some applications of convection in everyday life?

• Cooling, freezing, melting

• Drying, dehydrating, evaporating

• Mixing, stirring, blending

• Cooking, heating, boiling

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

How does convection help in cooking food?

• Convection helps in cooking food by using microwaves.

• Convection helps in cooking food by using direct heat from a flame.

• Convection helps in cooking food by adding water to the food.

• Convection helps in cooking food by circulating hot air around the food.

Explain how convection is involved in weather patterns.

• Convection is only involved in weather patterns during the winter months.

• Convection is involved in weather patterns as warm air rises and cool air sinks, creating vertical movement of air masses.

• Convection only affects the temperature of the air, not the movement.

• Convection is not involved in weather patterns.

Tags

NGSS.MS-ESS2-5

NGSS.MS-ESS2-6