Thermal Properties Of Matter Flashcards
Temperature
Temperature is the quantitative representation of degree of hotness or coldness
Latent heat of fusion
The amount of heat energy required to convert 1gm substance from solid to liquid without changing it’s temperature is latent heat of fusion
Latent heat of vaporisation
The amount of heat energy required to convert 1 gram of substance from liquid to gaseous state without changing its temperature is latent heat of vaporisation
Units and dimensions for specific gas constant
Units: J Kg-1 K-1
Dimensions: L2 T-2 K-1
Wein’s Displacement law
In thermal radiation, as the temperature of the body increases, the wavelength corresponding to maximum energy decreases
Coefficient of thermal conductivity
It is defined as the quantity of heat required per sec per unit area of cross section per unit temperature gradient
Temperature gradient
Change of temperature per unit length in the direction of heat flow is known as temperature gradient
Emissive power
The energy flux emitted by unit surface area of a radiating body is known as emissive power
Emissivity
It is defined as the ratio of the emissive power of the body to that of black body at the same temperature
Units and dimensions of coefficient of convection
Units: W/m2 DegreeCelsius
Dimensions: MT-3 K-1
Newtons Law of cooling
The rate of loss of heat is directly proportional to the difference in temperature between the body and its surroundings
Absorptive power
The ratio of energy flux absorbed in certain time to total energy flux incident on the body in the same time is known as absorptive power
Heat
Heat is a form of energy that flows between a body and the surrounding medium by virtue of temperature difference between them
