Question

heat transfer is concerned with the calculation of the amount of heat

True/false

insulators cannot conduct heat well because of the existence of free electrons

True/false

conduction heat transfer can take place in solid,liquid and gases

True/false

thermal conductivity k is a property of a material that measures its abillity to store energy

True/false

Answer 1

1- Heat transfer is the mechanism of energy transfer. Heat transfer in three modes, Conduction, Convection and Radiation. First statement is false because Heat transfer is a mechanism of energy transfer.

2- An insulator is a material that does not allow a transfer of electricity or energy. Materials that are poor thermal conductors can also be described as being good thermal insulators. Second statement is false. Insulator dont have free electrons

3- Conduction : Mode of heat transfer through the direct contact. conduction can take Solid liquid and gases. Solids are better conductor of heat than Liquid and gas. Statement no 3 is true

4- Thermal Conductivity : It is the rate at which material transfer heat through it. More the thermal conductivity more the rate of heat transfer. Statement 4 is false.