Answer:
Weight of air per unit area is pressure due to atmosphere. So here correct answer is Weight
Explanation:
As we know that air pressure is given by
[tex]P = \frac{Force}{Area}[/tex]
now we know that force here due to air is due to the weight of the air
so here in order to calculate the weight we will have
[tex]Weight = mg[/tex]
[tex]Weight = \rho Ah g[/tex]
here we know that
Ah = volume of air above the point where pressure is to be calculated
now from above formula we have
[tex]P = \frac{\rho AH g}{A} = \rho g h[/tex]
so here we can say that pressure is due to weight of air