short answer type questions
1)What is 'pressure'in physics?
2Do fluids exert pressure? In what direction?
3) What is the approximate value of atmospheric pressure on the surface of the Earth at sea
level?
4) Name the instrument used to measure atmospheric pressure.
5. How does atmospheric pressure vary with altitude?
6. How does the pressure in a liquid vary with depth? ?
Answers
answer 1:---
Pressure is defined as the physical force exerted on an object. The force applied is perpendicular to the surface of objects per unit area. The basic formula for pressure is F/A (Force per unit area).
answer 2:---
The particles of fluids are constantly moving in all directions at random. As the particles move, they keep bumping into each other and into anything else in their path. These collisions cause pressure, and the pressure is exerted equally in all directions.
answer 3:---
about 14.7 pounds per square inch
The standard, or near-average, atmospheric pressure at sea level on the Earth is 1013.25 millibars, or about 14.7 pounds per square inch
answer 4:---
barometer
A barometer is a scientific instrument used to measure atmospheric pressure, also called barometric pressure. The atmosphere is the layers of air wrapped around the Earth.
answer 5:---
Air pressure is higher at lower altitudes. Air density is higher at lower altitudes. There is more space between air molecules at higher altitudes. There is less oxygen to breathe at the top of a high mountain than there is at sea level.
answer 6:---
Pressure in a liquid - Higher
The pressure in a liquid is different at different depths. Pressure increases as the depth increases. The pressure in a liquid is due to the weight of the column of water above. Since the particles in a liquid are tightly packed, this pressure acts in all directions. For example, the pressure acting on a dam at the bottom of a reservoir is greater than the pressure acting near the top. This is why dam walls are usually wedge-shaped. The greater pressure at the bottom would give a greater ‘force per unit area’ on the wall.
I hope it will help you...
- Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. ...
- Yes. The particles of fluids are constantly moving in all directions at random
- 14.7 pounds per square inch
- barometer is the instrument used to measure the atmospheric peessure
- Atmospheric pressure decreases with increases in the altitude. As we know that the density of air becomes heavier near the surface of the earth (due to gravity) and begins to lighten as we go to higher altitudes and eventually leads to empty space, i.e. outside the atmosphere of the earth. Thus, the atmospheric pressure is high at lower altitudes, the density being higher. The atmospheric pressure is low at higher altitudes, the density being lower.
- Liquid pressure varies with depth because the pressure at the surface is due to only atmosphere, but as the depth increases the amount of water above also increases so pressure increases.