In brief, ârhetoricâ is any communication used to modify the perspectives of others. But this is a very broad definition that calls for more explanation. The OWLâs â Introduction to Rhetoric â vidcast explains more what rhetoric is and how rhetoric relates to writing. This vidcast defines rhetoric as âprimarily an awareness of the language choices we make.â It gives a brief history of the origins of rhetoric in ancient Greece.
The lawof conservation of energy says that energy is neithercreated nor destroyed. When we use energy, itdoesnât disappear. We change it from one form ofenergy into another.A car engine burns gasoline, converting the chemicalenergy in gasoline into mechanical energy. Solar cellschange radiant energy into electrical energy. Energychanges form, but the total amount of energy in theuniverse stays the same.
Like an automobile only runs on gasoline, the human body runs on only one kind of energy: chemical energy. More specifically, the body can use only one specific form of chemical energy, or fuel, to do biological work â adenosine triphosphate (ATP). ATP â the gas in the tank. So, how does the human body make ATP, the only fuel it can convert to energy? Our bodies have three different chemical systems that convert energy. Most everyone knows that we use proteins, carbohydrates and fats for energy. Calories are measurement of a unit of heat or food energy.