Tropic or Cancer Variability 440 40-80 80-160 160 trom normal c10 10-15 15-20 20

Question

Tropic or Cancer Variability 440 40-80 80-160 160 trom normal c10 10-15 15-20 20-25 Antarctic Circle Figure 14.9 Average annual precipitation in centimeters Atmospheric Pressure Atmospheric pressure is the force exerted by the weight of the atmosphere. It varies over the face of Earth, primarily because of temperature differences. Typically, warm air is less dense than cool air and therefore, exerts less pressure. Cold, dense air is often associated with higher pressures. Pressure also 76 crm 9.92 in ) changes with altitude The instrument used to determine atmospheric pressure is the barometer (Figure 14.10). Two units that can be used to measure air pressure are inches of mercury and millibars. Inches of mercury refers to the height to which a column of mercury will rise in a glass tube that has been inverted into a reservoir of mercury. The millibar is a unit that measures the actu- al force of the atmosphere pushing down on a surface. Standard pressure at sea level is 29.92 inches of mercu- ry or 1,013.2 millibars (Figure 14.11). A pressure greater than 29.92 inches or 1,013.2 millibars is called high pressure. A pressure less than the standards is Mercury Air called low pressure. Mercury 55. If a barometer is located in the laboratory, record the current atmospheric pressure in both inches of mercury and millibars. If necessary, use Figure Figure 14.1ed by t Figure 14.10 Simple mercury barometer. The weight of the column of mercury is balanced by the pressure exerted on the 14.11 to convert the units. Inches of mercury: 8 Millibars ainches of mercury he column of mercury fails:; t inches of mercurydish of mercury by the air above. If the pressure decreases, the column of mercury falls; if the pressure increases,the

Explanation / Answer

55. Inches of Mercury : 29.92 inches

Millibars: 1013 millibars (mb)

Using the figure 14.12, the point 29.92 equivalent to 1013 mb

56. Atmospheric pressure decreases with increased in altitude because there is less atmosphere above to exert a force

p= height * specific gravity of air * gravity

The atmosphere height decreases so pressure decreases

57. Pressure changes with altitude most rapidly near Earth's surface

58. A city that is 200 meters above the sea level would add units to its barometric reading in order to correct its pressure to sea level.
The pressure on height is less than sea level so we need to add in lower value at higher altitude to compensate.
Please ask the rest of the question in separate questionnaire.

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