Heat plays a very important role in our daily lives as a heating system that keeps us warm in winter,in the summer we prefer to keep the house temperature lower by using the air conditioning system,heat engines generate power for cars, trucks, trains, diesel, certain heat engine running dynamo that generates electricity,electricity operate factory machinery, and other tools, our lives a lot depends on the heat,actually our own body is a heat engine, the food we eat is the fuel so that our bodies are still warm and provide energy for our activities
