Question

thermal energy transfer hot, less dense water rises water cools, becomes more dense, sinks convection: heat transferred by the circulation or movement of a liquid or gas. (fluids) multiple-choice question so convection is caused by the change in the _______ of the material. volume mass heat density rewatch

Explanation:

Convection relies on the movement of fluids. When a fluid is heated, it becomes less dense and rises; as it cools, it becomes denser and sinks, creating a circulation current. This cycle is driven by changes in the material's density. Other options do not directly cause the convective flow: volume change is a side effect, mass remains constant, and heat is the energy being transferred, not the cause of the convection mechanism.

Answer:

density