Question

what is density and pressure ?explain.

Answer 1

hi there,
Density is the mass of air molecules per unit volume. ... At sea level, air density is around 1.2 kg m-3. Air density decreases with altitude, for reasons discussed below. Pressure is the cumulative effect of the push exerted by each molecular collision on its surroundings. Pressure is defined as force per unit area.

Answer 2

a force is what make something move by pushing it all pulling it in a particular direction it may be invisible force like gravity or a visible force like a kick but it always causes something to either accelerated or decelerate or change shape forces always work in pairs whenever a force causes it must push against something as equally which is why guns kick back violently when fired