please solve it is urgent
Answers
Answer 1 :
a)
→ The atmospheric air extends up to many kilometers above the surface of the earth. The force per unit area exerted on the surface,by the weight of this huge mass exerts a pressure,at all points and all objects above the surface,is known as atmospheric pressure
It is caused due to weight of the air above the earth's surface.
b)
→ We do not normally feel this large atmospheric pressure there is also a presure inside our bodies that is almost same as this external air pressure. This internal pressure cancels the effect of this out side pressure and saves us from getting crushed under it.
c)
→ As we move upwards through the atmosphere, the height of air column,above us, decreases. This result in a decrease in air pressure at higher altitudes.
Answer 2 :
→ Rubber sùcker is used for installing hooks in a room. When we press the sùcker the air between the air sùcker and the wall gets forced out. Hence,the air, pressing on it from outside,holds ot firmly against the wall. If we wish to pull the sùcker off the surface,the force,applied by us,has to be large enough to overcome this effect of the atmospheric pressure.
Answer 3 :
→ At higher altitudes, the atmospheric pressure becomes less than the pressure exerted by the blood inside the body and breathing becomes difficult. Due to this, bleeding from nose may also occur.
Answer 4 :
→ The one example of usage of atmospheric pressure in our daily to daily life is When we drink liquid with a straw,the air pressure inside the straw decreases (due to our súcking) The air pressure,acting on the surface of liquid,then becomes greater than the pressure inside the straw. This forces the liquid to move up inside the straw and we're able to drink due to the atmospheric pressure.
Answer 5 :
→ In space there is no air to breathe,Space crafts are usually designed to help astronaut in breathing and to protect him from low pressure at the space. The air pressure in this is increased to a (sufficient) value that safeguards the astronaut.