Admin Table of Contents
- 1 What is a measure of force of air pushing on Earth?
- 2 What force acts between the molecules in the atmosphere and the Earth?
- 3 Is a measure of the force of air molecules per unit area in the atmosphere at a given altitude?
- 4 How is air pressure and the amount of air molecules connected?
- 5 What are the 2 instruments that measure air pressure?
- 6 What is a measure of force per unit area?
What is a measure of force of air pushing on Earth?
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.
What force acts between the molecules in the atmosphere and the Earth?
gravitational force
Molecule in the air in the atmosphere are attached by gravitational force of the earth.
What units are used to measure air pressure?
Description of pressure and its measurement. Atmospheric pressure is expressed in several different systems of units: millimetres (or inches) of mercury, pounds per square inch (psi), dynes per square centimetre, millibars (mb), standard atmospheres, or kilopascals.
Is a measure of the force of air molecules per unit area in the atmosphere at a given altitude?
Atmospheric pressure
Atmospheric pressure is defined as the force per unit area exerted against a surface by the weight of the air molecules above that surface.
How is air pressure and the amount of air molecules connected?
So what’s the connection between molecules and air pressure? If the number of air molecules above an area increases, there are more molecules to exert pressure on that area and its total atmospheric pressure increases. This is what we call high pressure.
How does air stay on Earth?
Gravity. Fortunately for us, Earth’s gravity is strong enough to hold onto its atmosphere. Mars, for example, is less than half Earth’s size and around one-tenth Earth’s mass. Less mass means less gravitational pull.
What are the 2 instruments that measure air pressure?
Mercury and aneroid barometers are the two main types of barometers used to measure air pressure.
What is a measure of force per unit area?
pressure, in the physical sciences, the perpendicular force per unit area, or the stress at a point within a confined fluid. In SI units, pressure is measured in pascals; one pascal equals one newton per square metre.