Posted by **cathy** on Monday, February 23, 2009 at 11:08am.

The percent of atmosphere above and below 16.8 km is?

- Science -
**Dr Russ**, Monday, February 23, 2009 at 11:12am
Do you want to calculate this?

Most of the atmosphere is below about 11 km. 100 km is deemed to be the point where the atmosphere stops.

16.8 km is usually taken as the top of the stratosphere.

- Science -
**bobpursley**, Monday, February 23, 2009 at 11:19am
Here is the way to calculate that:

Pressure is the weight of the atmosphere above where you measure pressure.

Pressure at sea level is 760mm. Pressure at 16.8km is 75mm

So above 16km, the percent of the atmosphere is

percent=75/760 * 100

below that height, it is 100 - that percent.

- Science -
**Cathy**, Monday, February 23, 2009 at 11:39am
I am working with a graph and if at every 5.6 km you cut in half the atmospheric mass. So at 16.8 km wouldn't you have 12.5% of the atmosphere above and 87.5% would be below?

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