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DOES AIR HAVE WEIGHT?

If air has no shape, does it have weight? It doesn't seem to have, does it? If there isn't anything on a scale, it doesn't register any weight; yet, air is on the scale at all times.

Ask mom or dad how much air they keep in the tires of the car. The answer will be a number of pounds! Do we know why that is?

We will weigh an uninflated balloon on a balance scale and record the weight. Next, we will blow up the balloon and weigh it again. Will the weights be the same?

Why not?

When we buy new playground equipment or inflated toys, the instructions may tell us how many pounds of air to put into the equipment.

Does this mean that free air--the kind that hangs around for us to breathe--does not have weight, but the same stuff, in a container, has weight?

 
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