What is the correct answer?


Which of the following has least value of conductivity?

A. Glass

B. Water

C. Plastic

D. Air

Correct Answer :

D. Air

Related Questions

The automobile radiator is a heat exchanger of If the temperature of a solid surface changes from 27°C to 627°C,… The amount of heat flow through a body by conduction is Sensible heat is the heat required to A grey body is one whose absorptivity The transfer of heat by molecular collision is smallest in When heat is transferred from one particle of hot body to another by actual… The critical radius is the insulation radius at which the resistance to… The unit of Stefan-Boltzmann constant is The logarithmic mean temperature difference (tm) is given by (where Δt1… The product of Reynolds number and Prandtl number is known as A designer chooses the values of fluid flow rates and specific heats in… Film coefficient is defined as the ratio of The insulation ability of an insulator with the presence of moisture would In a shell and tube heat exchanger, baffles are provided on the shell… Thermal diffusivity of a substance is In a heat exchanger with one fluid evaporating or condensing, the surface… An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated… The value of the wave length for maximum emissive power is given by In convection heat transfer from hot flue gases to water tube, even though… The ratio of the emissive power and absorptive power of all bodies is… The thermal diffusivities for solids are generally The unit of overall coefficient of heat transfer is A grey body is one whose absorptivity Kirchhoff's law states that A non-dimensional number generally associated with natural convection… The time constant of a thermocouple is Depending on the radiating properties, a body will be white when Which of the following statement is correct? Joule sec is the unit of