Energy Changes and Energy Conservation (continued)
Chemical energy is another kind of energy that seems different from that of the water in a reservoir, yet again is really quite similar. Chemical energy is a kind of potential energy in which chemical bonds act as the “storage” medium. Just as water releases its potential energy when it falls to a more stable position, chemicals release their potential energy in the form of heat or light when they undergo reactions and form more stable products.
A second point illustrated by the water falling over a dam involves the conservation of energy law. To keep track of all the energy involved, it’s necessary to take into account the entire chain of events that ensue from the falling water: the sound of the crashing water, the heating of the rocks at the bottom of the dam, the driving of turbines and electrical generators, the transmission of electrical power, the appliances powered by the electricity, and so on. Carrying the process to its logical extreme, in fact, it’s necessary to take the entire universe into account when keeping track of all the energy in the water because the energy lost in one form always shows up elsewhere in another form. So important is the conservation of energy law that it is also known as the first law of thermodynamics.
to keep track of: theo dõi
entire: toàn bộ
chain: dãy, chuỗi
ensue (+ from, on): sinh ra từ
transmission: sự truyền, sự chuyển giao
and so on: vân vân
universe: vũ trụ