# Summary

- Heat is a form of energy
- Heat can flow from a body to its surroundings by virtue of temperature difference.
- The degree of hotness or coldness is quantitatively represented as temperature.
- The Celsius temperature and Fahrenheit temperature are related by
- The ideal gas equation connecting pressure, volume, absolute temperature is PV = Î¼ RT Where Î¼ is the number of moles and R is the universal constant.
- The absolute scale temperature or Kelvin scale temperature can be written as T
_{C}= T Ã¢â‚¬â€œ 273.15 - The coefficient of linear expansion (a
_{i}) and volume expansion (a_{V}) are defined by the relations,

- The specific heat capacity of a substance is defined by
- where m is the mass of the substance andDQ is the heat required to change its temperature by DT.
- The molar specific heat capacity of a substance is defined by
**DQ = Î¼ CDT** - Where Î¼ is the number of moles of the substance.
- The latent heat of fusion is the heat per unit mass required to change a substance from solid into liquid at the same temperature and pressure. The latent heat of vaporisation is the heat per unit mass required to change a substance from liquid to the vapour state without change in the temperature and pressure.
- The three modes of heat transfer are conduction, convection and radiation.
- In conduction, heat is transferred between neighbouring parts of a body through molecular collisions, without any flow of matter
- Newton's Law of Cooling says that the rate of cooling of a body is proportional to the excess temperature of the body over the surroundings.