Because that is the definition of 1 atmosphere at standard temperature.
The air pressure changes based on altitude, but at sea level, it is 1 atm, or 760mmHg, or 760Torr.
Atmospheric pressure refers to the force per unit area exerted against a surface by the weight of air above that surface in the Earth's atmosphere. The standard atmosphere (symbol: atm) is a unit of pressure at sea level and is equal to 101325 Pascal.
Standard air pressure at sea level is 1 atmosphere, or 1 atm. This is the adopted standard atmosphere value, but sea level pressure will not always equal to this value due to changes in weather. 1 atm = 101 325 pascals = 1.01325 bars.
It is the standard atmospheric pressure at sea level. It is equal to 1 atm.
The air pressure is greatest at sea level.
This pressure, of nearly one atm., is basically the atmospheric pressure which exists at sea level.
The pressure at different altitudes depends on the weight of the air column above that point. At 14000 ft above sea level, there is less air above causing lower pressure (0.69 ATM). Conversely, at 14000 ft below sea level, there is more air above causing higher pressure (470 ATM).
Standard air pressure at sea level is 1 atmosphere, or 1 atm. This is the adopted standard atmosphere value, but sea level pressure will not always equal to this value due to changes in weather. 1 atm = 101 325 pascals = 1.01325 bars.
To convert gauge pressure to absolute pressure, you need to add the atmospheric pressure. Since the atmospheric pressure at sea level is 1 atm, the internal pressure in this case would be 2.7 atm (25 psi gauge pressure = 1.7 atm + 1 atm atmospheric pressure).
The air pressure changes based on altitude, but at sea level, it is 1 atm, or 760mmHg, or 760Torr.
In chemistry, atm stands for atmosphere, which is a unit of pressure equal to the average air pressure at sea level (approximately 1 atm). It is commonly used to measure gas pressure in laboratory experiments.
It's a measure of pressure. Specifically, it's the amount of pressure exerted by the air in the atmosphere at sea level.
It would be 1.0 ATM because it is at sea level.
The pressure at 500 meters below sea level is approximately 5 atm (atmospheres), which is equivalent to about 73 psi (pounds per square inch). This pressure increases by approximately 1 atm for every 10 meters of depth.
ATM stands for atmosphere- the air pressure at the surface at sea level- about 14.6959 pounds per sq. inch.
Atmospheric pressure is measured by a barometer and expressed in millibars. Normal atmospheric pressure at sea level is 1013 millibars.
Atmospheric pressure refers to the force per unit area exerted against a surface by the weight of air above that surface in the Earth's atmosphere. The standard atmosphere (symbol: atm) is a unit of pressure at sea level and is equal to 101325 Pascal.