$1$atm $= 101325$pa
$1$bar $= 100000$ pa
$1$atm $= 1.013$ bar
$1$bar $= 0.987$atm
From wiki:
The bar is a metric (but not SI) unit of pressure exactly equal to $100000$ Pa.[1] It is about equal to the atmospheric pressure on Earth at sea level.
Atmospheric pressure is the pressure exerted by the weight of air in the atmosphere.
My question: I presume ground level is higher than sea level. #Why is the pressure at sea level Less than at ground level?#
I thought that since sea level is at a lower level, there will be a greater weight of air and hence higher pressure on it compared to at ground level
Best Answer
As David has mentioned, you are interpreting too much into the value 101'325 Pa. This is an average pressure which can change quite a lot depending on the weather. E.g. if you are in a low pressure system, the sea level pressure can be far bellow 100'000 Pa, If the local weather is a high pressure system, it will be much higher than 101'325 Pa.
Of course you are right: ground level pressure is usually lower than sea level pressure.