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Air has some mass, and therefore weight. Under normal conditions, air has a mass of a bit more than one kilogram per cubic meter. For comparison, this is a bit over 1/1000 of the mass of water.

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How does a skydiver increase his or her terminal velocity?

adding weight and by decresing air recistance


Does adding air to an object increase the mass?

Yes, because the air has mass. Note that the amount by which the mass increases in this case is often insignificant.


How can you compress your suspension?

By adding weight to the car this will increase how much the suspension is compressed.


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How much mileage increase with add on air filter?

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How could you increase the air pressure inside a bag containing a group of air molecules?

You could increase the air pressure inside a bag by decreasing the volume of the bag, adding more air molecules to the bag, or increasing the temperature of the air molecules inside the bag.


How could you increase the preassure inside the ball without adding more air?

You could increase the pressure inside the ball by heating it up. When you heat the air inside the ball, the molecules move faster and spread out, causing an increase in pressure.


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How can air be warmed without adding heat energy?

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Does more air make a ball lighter?

Yes, it does. Actually, i don't think it does. It should make the ball heavier. A ball typically has a constant volume. Adding more air into it doesn't change the volume, but the pressure increases, and you are adding mass into the ball. Adding mass into the ball does make it heavier, and it becomes denser as well. Of course, the change in mass is quite small - you'd have to pump 1.3m3 of air into the ball to increase its mass by 1 kg