Question

Thermal diffusivity is defined as
1. the ratio of thermal conductivity to thermal
capacity per unit volume.
2. directly proportional to the thermal conductivity
3. inversely proportional to thermal conductivity
4. none of the above​

Answer 1

Answer:

inversely proportional to thermal conductivity

Answer 2

(3). Thermal diffusivity is defined as "inversely proportional to thermal conductivity".

Thermal diffusivity:

• The main distinction between thermal conductivity and diffusivity is that thermal conductivity refers to a material's ability to conduct heat.
• Whereas thermal diffusivity is the measurement of a material's rate of heat transfer from its hot end to its cold end.

Inversely proportional to thermal conductivity:

• Thermal conductivity (l) dictates HOW MUCH heat will flow through a substance.
• Whereas thermal diffusivity (a) determines HOW FAST heat will flow through it.
• Thermal conductivity, on the other hand, describes how quickly heat moves from the hot to the cold side of material under steady-state conditions.
• The ability of a material to transfer heat is referred to as thermal diffusivity.