Question

dav class 7 ch 5 heat​

Answer 1

Answer:

(a) Convection mode of heat transfer

(b) Conduction mode of heat transfer

(c) Radiation mode of heat transfer

(d) Radiation mode of heat transfer

Explanation:

There are three different modes of heat transfer that are as follows:

• Convection
• Radiation
• Conduction

Convection: Convection is the process of heat transfer by the bulk movement of molecules within fluids such as gases and liquids. The initial heat transfer between the object and the fluid takes place through conduction, but the bulk heat transfer happens due to the motion of the fluid.

Radiation: Radiation mode of heat transfer is a process where heat waves are emitted that may be absorbed, reflected, or transmitted through a colder body. Sun heats the earth by electromagnetic waves. Hot bodies emit heat waves.

Conduction: Conduction mode of heat transfer is the transfer of heat by means of molecular excitement within a material without bulk motion of the matter. Conduction heat transfer in gases and liquids is due to the collisions and diffusion of the molecules during their random motion.

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