This week, we learned about heat transfer. There are three types of heat transfer: conduction, convection, and radiation. Conduction is when heat molecules vibrate to heat other molecules. In convection, heat rises, then cools down, then goes up again. Convection is a flow of matter. It occurs in our oceans, our atmosphere, adn Earth's mantle. Radiation is when the sun gives us heat in rays. There are endothermic reactions and exothermic reactions. In endothermic reactions, heat is absorbed, so heat is a reactant. In exothermic reactions, heat is released so heat is a product. We learned how to calculate heat energy. Q= mc (deltaT) Heat energy is measured in calories or Joules. M is the mass measured in grams. C is the specific heat of the substance (cal/g degrees C or J/g degrees C). Delta T is the change in temperature (degrees C) = T final minus T initial. the equation Q=mc (delta T) describes the heating or cooling of a specific physical object. Each variable must refer to that specific object.
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