Which pressure must be measured to calculate the quantity of water flowing through a hydrant discharge?
a. operating
b. flow
c. residual
d. head
Answer: b. flow
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When you set a pot of tap water on the stove to boil, you'll often see bubbles start to form well before boiling temperature is ever reached. Explain this observation.
A. These are dissolved salts heating up and escaping from the water. B. They are very minute pockets of water in the gaseous phase. When they get large enough, the water will boil as this gas escapes. C. These bubbles are formed as the surrounding gases from the air dissolve into the water as it is heated. D. These initial bubbles are the gases that were dissolved in the water coming out of solution. The solubility of gases in water decreases with increasing temperature.
Which statement is an example of a chemical change?
A. Confetti is cut from pieces of paper. B. Water evaporates from a lake. C. Ice cubes are formed in the freezer. D. A plant converts carbon dioxide into carbohydrates. E. A tree is cut down in the forest.
________ combine(s) with human factors to create an ideal environment for forest fires in Southeast Asia
A) ENSO B) Hurricane season C) Trade winds D) Apple plantations
The text offers which of the following as a key example of a “linear system,” wherein components are spread out, easy to segregate, substitutable, and have little feedback between each other?
a. Nuclear power b. Automobile transportation c. Religiosity and miracles d. The valuation of national parks