# What is the atmospheric pressure at the planet's surface?

• JWHooper
In summary, the density of mercury on planet X is 13595 kg/m^3 and the gravitational field strength at the surface is 12.0 m/s^2. Using the equation P = P_0 + Dhg, we can solve for the atmospheric pressure at the planet's surface by plugging in the given values. Atmospheric pressure is the pressure that the atmosphere exerts on us and is equivalent to being at the bottom of a giant ocean of air. Therefore, P_0, the pressure at the surface, is equal to 0.
JWHooper

## Homework Statement

The density of mercury is 13595 kg/m^3. An barometer on the planet X shows a pressure reading of 1500 mm-Hg. The gravitational field strength at the surface of the planet is 12.0 m/s^2. What is the atmospheric pressure at the planet's surface?

## Homework Equations

P = F/A
D = m/V
P = P_0 + Dhg
P is the pressure, D is the density, m is the mass, F is the force, A is the area, V is the volume, h is the depth, and g is the gravitational constant.

## The Attempt at a Solution

D = 13595 kg/m^3 (mercury)
P = 1500 mm-Hg
g = 12.0 m/s^2
I don't know what atmospheric pressure is, really. If anyone could help, I would be very appreciated. This is important, because I don't want to fail my physics class.

J.

Well the only equation of any use to you is the last one you typed, and you found all but P_0, sooo...

atmospheric pressure is literally, well, that. The pressure the atmosphere exerts on us. We're basically at the bottom of a gigantic ocean of air that's crushing down on top of us. Except air isn't terribly dense so it doesn't really bother us obviously, not like if you're at the bottom of an ocean with dense water

blochwave said:
Well the only equation of any use to you is the last one you typed, and you found all but P_0, sooo...

atmospheric pressure is literally, well, that. The pressure the atmosphere exerts on us. We're basically at the bottom of a gigantic ocean of air that's crushing down on top of us. Except air isn't terribly dense so it doesn't really bother us obviously, not like if you're at the bottom of an ocean with dense water

Thus, P_0 = 0?

## 1. What is atmospheric pressure?

Atmospheric pressure is the force per unit area exerted by the weight of the Earth's atmosphere above a certain point on the planet's surface.

## 2. How is atmospheric pressure measured?

Atmospheric pressure is typically measured using a device called a barometer, which can be either a mercury barometer or an aneroid barometer. The measurement is usually given in units of pressure such as millibars (mb) or inches of mercury (inHg).

## 3. What factors affect atmospheric pressure?

The main factors that affect atmospheric pressure are altitude, temperature, and the presence of air molecules. As altitude increases, atmospheric pressure decreases. As temperature increases, atmospheric pressure also increases. The more air molecules present in a given space, the higher the atmospheric pressure.

## 4. What is the average atmospheric pressure at Earth's surface?

The average atmospheric pressure at sea level on Earth is approximately 1013 millibars (mb) or 29.92 inches of mercury (inHg). This is known as standard atmospheric pressure and is used as a reference point for measuring pressure changes.

## 5. How does atmospheric pressure affect weather?

Atmospheric pressure plays a crucial role in weather patterns. High atmospheric pressure typically indicates clear and dry weather, while low atmospheric pressure is associated with stormy and wet conditions. Changes in atmospheric pressure can also affect wind patterns and the formation of clouds.

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