Express 1 atmosphere in terms of `Nm^-2` and bar.

The most prominent gases in the atmosphere in terms of volume are

Calculate the pressure caused by gravitational copmression at the centre of the earth . Express the result in terms of standard atmospheric pressure .Mass of the earth = 6.0 xx 10^(24) kg , radius of the earth = 6.4 xx 10^(6) m and g ( at the surface of the earth ) =9.8 m s^(-2) . 1 standard atmospheric pressure = 10^(5) Nm^(-2) .

express 0.1bar25 in the form of p/q .

Express 1.bar(2) in the simplest form.

Express standard atmospheric pressure in (i) Nm^(-2) (ii) bars and (iii) torr.

A hole is made at the bottom of the tank filled with water (density =1000 kgm^(-3)) . If the total pressure at the bottom of the tank is three atmospheres (1 atmosphere =10^(5) Nm^(-2)) , then the velocity of efflux is nearest to