Definition of work heat and energy in thermodynamics
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Heat � The energy transferred from a hot object to a cold object.
It is important to understand the difference between heat and temperature.
Temperature � Intensive property
Heat � Extensive property
Recall that extensive properties (i.e. mass) are dependent upon the amound of a substance, while intensive properties (i.e. density) are independent of quantity.
As an example consider the difference between boiling a cup of water in one beaker and 10 gallons of water in another beaker. Both samples of water will boil at the same temperature (100� C), but we will have to heat the 10 gallon sample for a much longer time, because you have to put more heat (energy) into the big sample to get the same change in temperature (room temperature to 100� C).Work & Energy
Work � The energy required to move an object against a force.
Work = Force � distance
W = F � d
A good example of work is lifting an object against the force of gravity. Keep in mind that unless you move an object you cannot do any work. For example pushing against a wall, or spinning your car tires on ice are both situations where energy is expended but no work is done.
Energy � The capacity to do work or transfer heat.
To better understand the concept of energy lets take a look at the various types of energy
It is important to understand the difference between heat and temperature.
Temperature � Intensive property
Heat � Extensive property
Recall that extensive properties (i.e. mass) are dependent upon the amound of a substance, while intensive properties (i.e. density) are independent of quantity.
As an example consider the difference between boiling a cup of water in one beaker and 10 gallons of water in another beaker. Both samples of water will boil at the same temperature (100� C), but we will have to heat the 10 gallon sample for a much longer time, because you have to put more heat (energy) into the big sample to get the same change in temperature (room temperature to 100� C).Work & Energy
Work � The energy required to move an object against a force.
Work = Force � distance
W = F � d
A good example of work is lifting an object against the force of gravity. Keep in mind that unless you move an object you cannot do any work. For example pushing against a wall, or spinning your car tires on ice are both situations where energy is expended but no work is done.
Energy � The capacity to do work or transfer heat.
To better understand the concept of energy lets take a look at the various types of energy
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