ugh a very small opening it will be seen by meansof the dust which fills that portion of the air when twochalk erasers are tapped together near the opening, thatlight passes in straight lines. If the hand be held in thepath of this light for some time, the hand will becomeheated. When we place a… … Heat. 63 be energy in some form, whether it affects our senses orproduces chemical changes. The Radiometer consists of a bulb from which a large part of the airhas been exhausted, and an axis or spindle with four vanes of aluminumor mica attached to it. The vanes are blackened on one side…
Physics
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