Air Pressure…~……?
Thursday, October 15th, 2009 at
10:12 am
how do the following devices make use of air pressure?
1. siphon for transferring gasoline from a tank
2. fountain pen
3.vacuum cleaner
4. water pump
Tagged with: Pressure...~......
Filed under: Water Fountain Pumps
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1. Siphon
A siphon (also spelled syphon) is a continuous tube that allows liquid to drain from a reservoir through an intermediate point that is higher, or lower, than the reservoir, the flow being driven only by the difference in hydrostatic pressure without any need for pumping. It is necessary that the final end of the tube be lower than the liquid surface in the reservoir.
2.Fountain Pen
Fountain pens use a highly fluid ink. They rely on a property called capillarity to draw the ink into and through the feed. Capillarity causes the inner surface of the tubes to attract molecules of ink. These ink molecules, in turn, attract other ink molecules, and the feed fills with ink from the pen’s reservoir.
The feed in a fountain pen also includes a number of air passages that lead to the reservoir. These passages allow air to fill the top of the reservoir as ink is drawn from the bottom. Thus the air pressure inside the pet remains equal to the air pressure outside the pen, and the ink flows easily. If the air pressure inside the ink reservoir is lower than the atmospheric pressure outside, the ink will not reach the point and the pen will fail to write. However, if the air pressure over the ink column becomes greater than the air pressure outside the pen, ink will flood out from the front of the pen. To avoid such flooding, fountain pens are designed with a collector. The collector, which is located near the nib, consists of a series of fins and spaces that provide enough additional room to accommodate forward moving ink.
3. Vacuum Cleaner
A vacuum Cleaner’s suction is caused by a difference in air pressure. A pump reduces the pressure inside the tube. Atmospheric pressure then pushes the air through the carpet and into the tube, and so the dust is literally pushed into the bag.
4.Water Pump
A pump displaces a volume by physical or mechanical action. One common misconception about pumps is the thought that they create pressure. Pumps alone do not create pressure they only displace fluid causing a flow. Adding resistance to flow causes pressure.
1. As pressure is put upon the gasoline in a tank through siphon, the gasoline automatically gets out.
2. A fountain pen keeps ink within unless put in contact with a peace of paper because of internal vacuum formation (if ink gets out) as there isn’t enough space for air to rush in.It clearly signifies the role of air pressure.
3. Vacuum cleaner pumps the air out and creates vacuum which has enough force to get dust inside it as air pressure outside increases pushing the air in which gets the dust with it
4. Water pump creates pressure on up in itself by sucking air but sucked air creates vacuum whose pressure is enough to get water pushed in.