why has it been so difficult to examine the s
Why Has It Been So Difficult To Examine The Surface Of ...
One standard atmosphere (atm) is defined as exactly 1.01325×105 Pa. So how did we figure out that standard atmospheric pressure is 1.01325×105 Pa in the first place? Atmospheric pressure was first measured with a barometer.
…
Pressure.
Unit | Relationship |
---|---|
Pascal (Pa) | 1 = 1 |
Torr | atm |
1 mm Hg at 0o C | atm |
atmosphere (atm) | 101.3×105Pa |
A barometer over 10 m tall is very memorable. A trap should be used to prevent water being sucked into the vacuum pump. The water needs to be coloured, otherwise it is very difficult to see where the water column ends.
We know that pressure due to the water column is Pw=hwdwg. Here, hw is the height of the water column, and dw = 1 g/cm3 is the density of the water column and g is the acceleration due to gravity. We will now equate Pw and PHg to find the value of height hw.
Therefore, the height of water column which will exert on its base the same pressure as the 76 cm column of mercury is 1033.6 cm..
Answer: The answer is 981 KPa.
Description
A barometric reading below 29.80 inHg is generally considered low, and low pressure is associated with warm air and rainstorms.
The atmospheric pressure varies with altitude as the density of air decreases as we rise up and the air becomes rarer. Atmospheric pressure decreases with increases in altitude. … Thus, the atmospheric pressure is high at lower altitudes, the density being higher.
about 14.7 pounds per square inch
ρ = density of water in kg. m. g = gravitational force in 9.81 m.s. h = height in m.
…
The water pressure formula and SI unit are given as:
Back to top button