Hot-air balloons float because the air caught inside the balloon is heated up by a burner, making it less dense than the air outside. As the burner heats the air, it expands and some of the air escapes; that's what makes it less dense
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<h2>Percentage error is a measurement of the discrepancy between an observed and a true, or accepted value .</h2>
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substance is related to the average kinetic energy of the particles of that substance
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sorry don't know the answer but i really need the points sorry
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