When heat energy travels by convection, energy is transferred by the circulation of heated material.?

Question

True or False?

Answer 1

True.

Convection in the most general terms refers to the movement of molecules within fluids (i.e. liquids, gases and rheids)

Convection is one of the major modes of heat transfer and mass transfer. In fluids, convective heat and mass transfer take place through both diffusion – the random Brownian motion of individual particles in the fluid – and by advection, in which matter or heat is transported by the larger-scale motion of currents in the fluid. In the context of heat and mass transfer, the term "convection" is used to refer to the sum of advective and diffusive transfer.

A common use of the term convection leaves out the word "heat" but nevertheless refers to heat convection: that is, the case in which heat is the entity of interest being advected (carried). In one of two major types of heat convection, the heat may be carried passively by fluid motion which would occur anyway without the heating process (a heat transfer process termed loosely as "forced convection").

In the other major type of heat convection, heating itself may cause the fluid motion (via expansion and buoyancy force), while at the same time also causing heat to be transported by this motion of the fluid (a process known loosely as natural convection, or "free convection").

In the latter case, the problem of heat transport (and related transport of other substances in the fluid due to it) is generally more complicated. Both forced and natural types of heat convection may occur together.

Answer 2

True, warm air rises because it is less dense.