21.   That would have produced intense heat and could have started an explosion in any of several aircraft tires that were also stored in the hold.

22.   That is a lower energy state, and the surplus energy makes the atoms vibrate, producing heat.

23.   The filter reflects away low-frequency energy that produces heat, but allows sufficiently energetic photons to pass and stimulate a flow of electrons in the photo cell.

24.   The higher the compression pressure, the more heat produced and the greater the octane needed.

25.   The higher the compression ratio, or the more compressing the piston has to do, the more heat produced.

26.   The key lesson to remember here is not that you need a stove that produces ultra-high heat but that you should use the high heat that your stove produces.

27.   The problem with that is that the fast-moving abrasive wheel produces much heat that can draw the temper, or soften the blade, from the tip.

28.   The resistance produced heat which ignited and consumed the dry sponge.

29.   The roof holds solar panels that store energy and produce heat for wash water.

30.   The smaller circuits will enable the chip to run faster and produce less heat.