1 standard atmosphere (at) = 760 torr = 9,8692.10e-6 Pa = 0,98692 bar

1 atmosphere, at sea level.

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.

At standard temperature and pressure (25 Celcius and 1 Atmosphere) it will be a liquid.

Below -7.2 °C it will be solid

Above 58.8 °C it will be a gas

(Again assuming standard pressure of 1 Atmosphere)

Because that is the definition of 1 atmosphere at standard temperature.