application of atmospheric pressure and pressure
Answers
Atmospheric pressure, sometimes also called barometric pressure, is the pressure within the atmosphere of Earth. In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point. As elevation increases, there is less overlying atmospheric mass, so that atmospheric pressure decreases with increasing elevation. Pressure measures force per unit area, with SI units of Pascals. On average, a column of air with a cross-sectional area of 1 square centimetre, measured from mean sea level to the top of Earth's atmosphere, has a mass of about 1.03 kilogram and exerts a force or "weight" of about 10.1 newtons or 2.37 lbf, resulting in a pressure at sea level of about 10.1 N/cm² or 101 kN/m². A column of air with a cross-sectional area of 1 in² would have a mass of about 6.65 kg and a weight of about 65.4 N or 14.7 lbf, resulting in a pressure of 10.1 N/cm² or 14.7 lbf/in².
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Answer:
Atmospheric pressure can be measured by an instrument called a barometer.
Applications of pressure-
• we use a sharp knife to cut things rather than a blunt knife. It is because the edge of a sharp knife has a very small area of contact. This produces a very large pressure with a small applied force. This makes it easier to cut things with less effort.
• various objects such as port pins, needles and nails have pointed ends. This reduces the area of contact and makes it easier for these objects to penetrate the targets such as paper, clothes, skins, and walls.
• high rise buildings have White Foundation so that the enormous weight of search buildings produce less pressure on the ground. If the foundation of high rise building is need narrow, then the building missing in Underground 2 to its enormous weight.
• there are wooden sleepers below railway track. It reduces the pressure exerted by release and trains on ground.
• school bags have wide straps. It is done to increase the surface area of contact and reduce the pressure exerted on the shoulders by the weight of the bag.