Conduction and convection
None of the above
Liquids and gases
Gases and solids
The air in the bag has become less dense
The mass of the paper bag has decreased
The chemical compositions of the air in the bag has changed
The mass of the air in the bag has increased
Conduction cannot take place when the heater is at the top of the tank
The heated water will rise and form a convection current
Radiant heat travels faster in the upward direction
The heater must be covered by water at all times
The water contracts and its density decreases.
The water contracts and its density increases.
The water expands and its density decreases.
The water expands and its density increases.
Because of density differences in a liquid
Because of temperature differences in a solid
By the diffusion of molecules through a fluid
By the vibration of molecules about a mean position
Lighting a candle beneath the container
Floating a piece of ice on the water
Placing a lighted bulb just above the water surface
Dropping a piece of hot metal into the water
Conducted away from the ice through the air
Convected away from the ice through the water
Conducted from the upper to the lower surface of the ice
Convected towards the ice through the air
Brownian motion is a form of convection.
Convection occurs only in gases.
Convection results from a density change.
Evaporation is a form of convection.