$1$atm $= 101325$pa
$1$bar $= 100000$ pa
$1$atm $= 1.013$ bar
$1$bar $= 0.987$atm
The bar is a metric (but not SI) unit of pressure exactly equal to $100000$ Pa. 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