| 单词 | rarefaction |
| 释义 | rarefaction (once / 32741 pages) n A decrease in the density of something is rarefaction. As you climb a mountain, you experience rarefaction of the air; the air becomes less dense the higher up you go. Most of the time, rarefaction refers to air or other gases becoming less dense. When rarefaction occurs, the particles in a gas become more spread out. You may come across this word in the context of sound waves. A sound wave moving through air is made up of alternating areas of higher and lower density. The areas of lower density are called rarefactions. WORD FAMILYrarefaction: rarefactions+/rarefy: rarefaction, rarefied, rarefies, rarefying USAGE EXAMPLESThe compressions and rarefactions are rapidly transmitted through the air from the original source as a wave, making sound. Scientific American(Mar 27, 2014) Then, too, in extreme states of rarefaction of the sun’s absorbing layer, the absorption of the oxygen is too small to be sensible to us. Clodd, Edward, Pioneers of Evolution from Thales t...(2012) When the air becomes lighter, it is said to be rarefied, and this rarefaction ought apparently to be greatest where the temperature is highest. Rameur, E., The Catholic World; Volume I, Issue...(2012) n a decrease in the density of something a sound wave causes periodic rarefactions in its medium Hyper concentration increase in density |
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