The answer is 0.4
Within 6.6 km (0.4 mi.) of the Earth's surface, approximately one-half of the atmosphere by mass or weight (found between sea level and the height at which air pressure level is 600 mb) is located.
What is atmosphere pressure?
- The air around you is heavy, and it pounds against everything it comes into contact with. That pressure is known as atmospheric pressure, sometimes known as air pressure. It is the force exerted by the air above a surface while gravity draws it to Earth.
- The weight of the air molecules above causes atmospheric pressure. Even small air molecules have weight, and the massive quantities of air molecules that make up our atmosphere's layers together have a lot of weight, which bears down on whatever lies below.
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