air pressure machines

On commercial scale, nitrogen is obtained by the fractional distillation of liquefied air. The compressed carbon dioxide free air is liquefied by allowing it to expand in a region of low pressure. The liquefied air is then subjected to fractional distillatio..

Air is pulled towards the surface by gravity and this exerts pressure on the Earth's surface. The pressure exerted by the gases of the atmosphere on the surface of the Earth is called atmospheric pressure..

The atmosphere is the layer of air around the earth. It extends up to 1000 km above the surface of the earth and has a total weight of 4.5 10 1 8 kg (i.e., five million billion tons). This weight exerts a pressure on the surface of the earth which is called atmospheric ..

The gaseous envelope surrounding the Earth is called earth's atmosphere, extending to a few kilometres above the surface. The pressure exerted by the atmosphere is called atmospheric pressure. The magnitude of this pressure is nearly 1.01x10 5 N/m 2 (Refer Torricelli..

Pressure in a Liquid - We can investigate pressure in a liquid by using the apparatus shown in figure belo..

Air Pollution - Humans can only live about five minutes without air. Dry air is generally a homogeneous mixture (solution) of nitrogen gas (78%), oxygen gas (21%), and traces of other gases. Some of the other gases are waste products of human activities and are known a..

The transmission of power is made use of in hydraulic machines where a small force applied at one point is made to exert a much larger force at some other point. This principle is made use of in the working of a hydraulic press and hydraulic brake..

Atmospheric pressure is used in many of the things that we do. For example, when we drink water with a straw [figure (a) shown below], while sucking, our lungs expand and air in the drinking straw goes into them. The air pressure in the straw decreases and th..

The chief source of free nitrogen is atmospheric air and nitrogen is usually prepared from it. Air free from dust, water vapour and carbon dioxide is compressed in a compression chamber for liquefaction. Firstly, the pressure on the air is increased to ..

A wave motion, in which the particles of the medium oscillate about their mean positions in the direction of propagation of the wave, is called longitudinal wave. Sound waves are classified as longitudinal waves. Let us now see how sound waves propagate. Take a tuning fork, vibrate it and concentr..