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You can’t see the particles that make up the gases in air. How can they have mass?

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Answer:

Although air is made up of particles too small to be seen, they still contain mass. These particles are made up of molecules which contain atoms that interact with each other and have a certain amount of mass, as well as kinetic energy. The mass of the gases in air can also be determined by measuring the gravitational pull they exert on objects in the atmosphere.

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