what is the difference between a negative temperature and a positive temperature
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☞ Negative temperature
A substance with a negative temperature is not colder than absolute zero, but rather it is hotter than infinite temperature.
☞ Positive temperature
A positive temperature coefficient (PTC) refers to materials that experience an increase in electrical resistance when their temperature is raised. Materials which have useful engineering applications usually show a relatively rapid increase with temperature, i.e. a higher coefficient.
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