Question

explaining how a lava lamp works
refer to the image of a lava lamp to answer the question. in a lava lamp, a waxy substance rises and falls repeatedly. what causes the waxy substance to rise?
check all that apply.

the waxy substance is cold.
the waxy substance is warm.
the waxy substance is less dense than the surrounding liquid.
the waxy substance is more dense than the surrounding liquid.
convection is occurring.

Explanation:

• When the waxy substance is warm, it expands and becomes less dense than the surrounding liquid. According to the principle of buoyancy, less - dense substances rise in more - dense fluids.
• Convection is the transfer of heat through the movement of fluids (liquids or gases). In a lava lamp, the heating and subsequent movement of the waxy substance (due to density changes) is an example of convection.

Answer:

• The waxy substance is warm.
• The waxy substance is less dense than the surrounding liquid.
• Convection is occurring.