what is barometric pressure?

Answer 1

The pressure of the atmosphere. (approximately 14.7 psi)

The fluctuations are measured by how many inches of mercury will rise in a tube due to the force of the air pressure outside the tube (there is a vacuum inside the tube). The standard measurement in the USA for atmospheric pressure in therefore in inches of mercury (inHg).

Answer 2

Atmospheric pressure or barometric pressure is the pressure at any point in the Earth's atmosphere.

In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point. Low pressure areas have less atmospheric mass above their location, whereas high pressure areas have more atmospheric mass above their location. Similarly, as elevation increases there is less overlying atmospheric mass, so that pressure decreases with increasing elevation. A column of air 1 square inch in cross section, measured from sea level to the top of the atmosphere, would weigh approximately 14.7 lbf. A 1 m² column of air would weigh about 100 kilonewtons (equivalent to a mass of 10.2 tonnes at the surface).

Answer 3

the weight of air in a barometric scale

The weight of the air that makes up our atmosphere exerts a pressure on the surface of the earth. This pressure is known as atmospheric pressure. Generally, the more air above an area, the higher the atmospheric pressure. This, in turn, means that atmospheric pressure changes with altitude. For example, atmospheric pressure is greater at sea-level than on a mountaintop. To compensate for this difference in pressure at different elevations, and to facilitate comparison between locations with different altitudes, meteorologists adjust atmospheric pressure so that it reflects what the pressure would be if measured at sea-level. This adjusted pressure is known as barometric pressure.

Barometric pressure changes with local weather conditions, making barometric pressure an important and useful weather forecasting tool. High pressure zones are generally associated with fair weather, while low pressure zones are generally associated with poor weather. For forecasting purposes, the absolute barometric pressure value is generally less important than the change in barometric pressure. In general, rising pressure indicates improving weather conditions, while falling pressure indicates deteriorating weather conditions.

You got love that cut n' paste, don't you.

Answer 4

(m)

Atmospheric pressure is the pressure at any point in the Earth's atmosphere.

In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point. Low pressure areas have less atmospheric mass above their location, whereas high pressure areas have more atmospheric mass above their location. Similarly, as elevation increases there is less overlying atmospheric mass, so that pressure decreases with increasing elevation. A column of air 1 square inch in cross section, measured from sea level to the top of the atmosphere, would weigh approximately 14.7 lbf. A 1 m² column of air would weigh about 100 kilonewtons (equivalent to a mass of 10.2 tonnes at the surface).

Answer 5

You already have your answer but to see it in action go to any large cave with a small entrance. The cave breathes. Equalizing the barometric pressure. It will be blowing or sucking air.
Happy Caving Carroll