The pressure of a gas in terms of its mean kinetic energy per unit volume 'E' is equal to
A
$$\frac{{\text{E}}}{3}$$
B
$$\frac{{\text{E}}}{2}$$
C
$$\frac{{3{\text{E}}}}{4}$$
D
$$\frac{{2{\text{E}}}}{3}$$
Correct Answer: $$\frac{{2{\text{E}}}}{3}$$