Explain how a psychrometer works and how it is used to measure humidity values
What will be an ideal response?
Answer: The simplest and most widely used instrument for measuring humidity, the sling psychrometer, consists of a pair of thermometers, one of which has a cotton wick around the bulb that is saturated with water. The other thermometer has no such covering and simply measures the air temperature. The two thermometers, called a wet bulb and dry bulb thermometer, respectively, are mounted to a pivoting device that allows them to be circulated ("slung") through the surrounding air. If the air is unsaturated, water evaporates from the wet bulb, whose temperature falls as latent heat is consumed. After about a minute or so of circulating, the amount of heat lost by evaporation is offset by the input of sensible heat from the surrounding, warmer air, and the cooling ceases. Thereafter, the wet bulb maintains a constant temperature no matter how long the instrument is swung around.
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Consider a Mediterranean climate in the Northern Hemisphere. In what months does the rainy season occur? Why does rainfall occur mostly at this time of year and not at other times?
What will be an ideal response?
What transportation technology is needed to take advantage economically of the oil wealth of Central Asia?
A) waterways B) highways C) pipelines D) railroads E) specialized oil tankers
Doppler radar is of limited use in creating hurricane storm warnings because:
A) Doppler radar cannot penetrate into the center of a mature hurricane. B) Doppler radars are not commonly used in coastal areas. C) Doppler radar is not very accurate at measuring rainfall intensity associated with the hurricane. D) hurricanes must be within 320 km of the coast for Doppler radar to "see" them.
What is used to connect individual sections of hose together to extend their length?
a. Higbee b. Appliance c. Rocker d. Coupling