- #1

- 374

- 0

## Homework Statement

Estimate the number density of gas molecules in the earth's atmosphere at sea level.

## Homework Equations

## The Attempt at a Solution

The question doesn't give me any further information and I am wondering about temperature---should I just say it's at STP? I found in my book that the density of air at STP is 1.3 kg/m^3.

Here's what I did:

PV=NkT

P/kT =N/V

(101300Pa)/(1.38E-23)(273 K)=2.7 * 10^25 molecules/m^3