The body temperature of a healthy man is :

Deliquescent substances do not changes its state on exposure to air

The dimensions of a substance are increased if the temperature of the substance is decreased.

Body temperature of reptiles is not constant.

When a substance is heated, its temperature _____

A body at a temperature of 50^0F is placed outdoors where the temperature is 100^0F . If the rate of change of the temperature of a body is proportional to the temperature difference between the body and its surrounding medium. If after 5 min the temperature of the body is 60^0F , find (a) how long it will take the body to reach a temperature of 75 ^0 F and (b) the temperature of the body after 20 min.

True or False - If False give the correct answer : If the chemical properties of a substance remain unchanged and the appearance or shape of a substance changes it is called a periodic change.

Heat energy flows from a body at low temperature to a body at higher temperature.

What do you meant by change of state of a substance ?