Frequently Asked Questions
Temperature is a measure of the degree of hotness or coldness of a body and determines the direction of heat flow.
Heat is a form of energy transferred from one body to another due to a temperature difference.
No
Thermal equilibrium is the state in which bodies in contact attain the same temperature and no net heat transfer occurs.
If two systems are each in thermal equilibrium with a third system
It forms the basis of temperature measurement and the construction of thermometers.
Thermal expansion is the increase in dimensions of a substance when its temperature rises.
Linear expansion
It is the fractional change in length per unit original length per unit rise in temperature.
Change in length is given by \( \Delta L = L_0 \alpha \Delta T \).
Areal expansion is the increase in surface area of a solid due to rise in temperature.
Volumetric expansion is the increase in volume of a substance with temperature.
For isotropic solids
To allow thermal expansion and prevent buckling during high temperatures.
Water contracts on heating from \(0^\circ\text{C}\) to \(4^\circ\text{C}\) and expands beyond \(4^\circ\text{C}\).