A. Heat that does not affect the thermometer and which expands itself in changing the nature of a body, such as turning ice into water or water into steam.
Q. Under what circumstances do bodies get latent heat?
A. When they are passing from a solid state to a liquid or from a liquid to a gaseous state.
Q. How can latent heat be recovered?
A. By bringing the body back from a state of gas to a liquid or from that of a liquid to that of a solid.
Q. What is meant by a thermal unit?
A. The heat necessary to raise one pound of water at 39 degrees Fn. 1 degree Fahrenheit.
Q. If the power is in coal, why should we use steam?
A. Because steam has some properties which make it an invaluable agent for applying the energy of the heat to the engine.
Q. What is steam?