Table of Contents
What causes air pressure at any point on Earth quizlet?
The atmosphere is held around the Earth by gravity. Gravity pulls gas molecules in the atmosphere toward the Earth’s surface, causing air pressure.
What force is responsible for the air pressure?
That pressure is called atmospheric pressure, or air pressure. It is the force exerted on a surface by the air above it as gravity pulls it to Earth. Atmospheric pressure is commonly measured with a barometer. In a barometer, a column of mercury in a glass tube rises or falls as the weight of the atmosphere changes.
Why does the atmosphere exert pressure on the earth?
Because gas particles in the air—like particles of all fluids—are constantly moving and bumping into things, they exert pressure. The pressure exerted by the air in the atmosphere is greater close to Earth’s surface and decreases as you go higher above the surface. You can see this in the Figure below.
What is the cause of atmospheric pressure?
Air pressure is caused by the weight of the air molecules above. This pressure causes air molecules at the Earth’s surface to be more tightly packed together than those that are high in the atmosphere.
Does rain occur in high or low pressure?
Generally speaking low and high pressure areas are associated with vertical movement of the air. Air rises in a low pressure area and falls in a high pressure area. In a low pressure area the rising air cools and this is likely to condense water vapour and form clouds, and consequently rain.
Is a Mountain wind a high pressure system?
When the air sinks on the leeward side of the mountains, it forms a high pressure zone. The windward side of a mountain range is the side that receives the wind; the leeward side is the side where air sinks. The descending air warms and creates strong, dry winds.
What are the two main forces that make air flow on Earth?
The speed and direction of the wind is governed by three forces; the pressure gradient force (PGF), the Coriolis Force and friction. PGF is the force produced by differences in barometric pressure between two locations and is responsible for the flow of air from an area of high pressure to an area of low pressure.
What is friction caused by air in Earth’s atmosphere known as?
Turbulent drag occurs when Earth’s surface or objects on it cause resistance to airflow and reduce the wind speed.
What is the air pressure on the Earth?
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. The gauge pressure in my automobile tires is a little more than twice that value.
Why do gas exerts pressure?
Due to weaker intermolecular attraction between the particles, they keep colliding with each other and also with the wall of the container exerting force and pressure. This changes the direction of the motion of the molecule. In return, the molecules also exert pressure on the wall. Hence, gas exerts pressure.
What is Earth’s air pressure?
atmosphere (atm) (atm) unit of measurement equal to air pressure at sea level, about 14.7 pounds per square inch. Also called standard atmospheric pressure.
What are the three main factors that influence atmospheric pressure?
1)The 3 main factors that affect barometric (air) pressure are:
- Temperature.
- Altitude or Elevation.
- Moisture ow water vapour.