Heat (Encyclopedia of Science)
Heat is the energy that flows between two objects because of a difference in temperature. Heat always flows from a body at a higher temperature to one at a lower temperature.
Scientists use the term heat differently than do nonscientists. The average person may think of heat as the amount of energy contained in a body. The correct term for that property, however, is thermal energy.
Thermal energy and temperature
According to the kinetic theory of matter, all matter is composed of particles that are constantly in motion. Temperature is a measure of the motion of those particles. The more rapidly particles are in motion, the higher the temperature; the less rapidly they are moving, the lower the temperature.
In theory, it would be possible to reduce the motion of the particles in an object to zero. In that case, the object would contain no thermal energy. The temperature at which all particle motion ends is called absolute zero. Scientists have come within a few millionths of a degree of absolute zero but have never actually reached that point.
(The entire section is 847 words.)
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Heat (Science Experiments)
What is convection?
Conduction: Which solid materials are the best conductors of heat?
Design Your Own Experiment
Your feet are bare, and the Sun has been beating down on the sidewalk outside your home all day. You form a or educated guess that the sidewalk is cool enough to allow you to walk on it without burning your feet. You decide to test your hypothesis, knowing that if you are wrong, you could be in for some painful moments!
But how does heat from the sidewalk burn your feet? HeatA form of energy produced by the motion of molecules that make up a substance. is a form of energy produced by the motion of molecules that make up a substance. The faster the molecules move, the more heat they produce and the higher the temperature of the sidewalk or other substance. is the measure of the average energy of the molecules in a substance. Heat can travel from one body to another in three ways: by conduction, by convection, and by radiation.
Conduction is the flow of heat through a solid. When you walk on a hot sidewalk, the...
(The entire section is 3366 words.)