Rarefy

(verb.) weaken the consistency of (a chemical substance).

(verb.) make more subtle or refined.

(verb.) lessen the density or solidity of; 'The bones are rarefied'.

校对:韦恩

• That the lower region of air is often more heated, and so more rarefied, than the upper; consequently, specifically lighter. 本杰明·富兰克林. 富兰克林自传.
• Add that the water, being heated and rarefied by the subterraneous fires, may emit fumes, blasts, &c. 本杰明·富兰克林. 富兰克林自传.
• In our study of the atmosphere we saw that air can be compressed and rarefied; in other words, we saw that air is very elastic. 伯莎M.克拉克. 科学通论.
• The air rarefied between the tropics, and rising, must flow in the higher region north and south. 本杰明·富兰克林. 富兰克林自传.
• From a commercial and industrial standpoint a most important class of pump is that known as the compression type; in these, air or any other gas is compressed rather than rarefied. 伯莎M.克拉克. 科学通论.
• The air under the equator and between the tropics being constantly heated and rarefied by the sun, rises. 本杰明·富兰克林. 富兰克林自传.

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