Question

what is heat

Answer 1

There is a good explanation of heat here:
http://en.wikipedia.org/wiki/Heat

Answer 2

Heating is energy moving from a hotter body to a cooler

Answer 3

Heat can be said as the energy which is responsible for raising the temperature or reducing the temperature of another body through transferring.

Answer 4

Heat may be defined as energy in transit from a high temperature object to a lower temperature object. An object does not possess "heat"; the appropriate term for the microscopic energy in an object is internal energy. The internal energy may be increased by transferring energy to the object from a higher temperature (hotter) object - this is properly called heating.

Answer 5

this website explains heat in more details with diagrams and examples

Answer 6

http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/heat.html

Answer 7

what exactly do you want about heat???

Answer 8

Heat is the kinetic energy of atoms and molecules. The more the atoms and molecules move and bump into each other, the hotter the object is.

Answer 9

There are a lot of good answers above. There does seem to be some blurring of some distinctions above, though. The Kinetic Molecular Theory (singlesixx is referring to) explains that temperature is a result of the average kinetic energy of particles moving in the system. But, temperature, a measure of thermal energy in a system, is not heat. The explanations above that define heat as the transfer of thermal energy are on point. In thermodynamics heat is Q. The first law of thermodynamics would define Q as:
\[Q = \Delta U + W\] \[\Delta U\] is the change in internal energy of a system (remember, heat is energy being transfered) and W is the work done by the system (because, remember that energy is the ability to do work, we need to account for energy used to do work).