Hi.huyhohoang said:Hello everyone!
As we've known, the pressure at the bottom of a volume of gas is define by its weight times the height. So I wonder why the atmospheric pressure is equal in all direction?
Many thanks
This is not true. Weight times height doesn't even have the right units to be a pressure.huyhohoang said:Hello everyone!
As we've known, the pressure at the bottom of a volume of gas is define by its weight times the height.
I think the statement about it being "the bottom of a volume" implies the OP correctly understands it's over the surface area at the bottom of the column.nasu said:This is not true. Weight times height doesn't even have the right units to be a pressure.
But the result would still be wrong. Weight times height does not have units of force.russ_watters said:I think the statement about it being "the bottom of a volume" implies the OP correctly understands it's over the surface area at the bottom of the column.
Yeah - he shouldn't have said height at all since he already has the weight. Still is only tangential to the question he's asking, so probably not worth the extra few posts discussing it.jbriggs444 said:But the result would still be wrong. Weight times height does not have units of force.
Density times height -- now that would have units of pressure -- at least if you measured density in force units.
Atmospheric pressure is the force per unit area exerted by the weight of the atmosphere above a given point. It is caused by the gravitational pull of the Earth on the gases in the atmosphere.
Atmospheric pressure is equal because the weight of the atmosphere is evenly distributed across the Earth's surface, resulting in equal pressure at all points. This is due to the constant circulation of air and the Earth's rotation.
Atmospheric pressure is measured using a device called a barometer. This instrument measures the pressure exerted by the atmosphere by balancing the weight of a column of air with the weight of a column of mercury or aneroid cells.
The main factors that affect atmospheric pressure include altitude, temperature, and humidity. As altitude increases, atmospheric pressure decreases. As temperature and humidity increase, atmospheric pressure also increases.
Atmospheric pressure is important because it helps to regulate the Earth's weather and climate. It also plays a crucial role in the water cycle and the distribution of heat on our planet. It is also important for the survival of living organisms, as they require a certain level of atmospheric pressure to function properly.