…mention the fact that it carries a bonus amounting to six months’ salary"; continued with some account of the technique for preserving the excised ovary alive and actively developing; passed on to a consideration of optimum temperature, salinity, viscosity; referred to the liquor in which the detached and ripened eggs were kept; and, leading his charges to the work tables, actually showed them how this liquor was drawn off from the test-tubes; how it was let out drop by drop onto the…
There are no more uses of "viscosity" in the book.
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In simple terms, 10W-30 grade oil means the oil has a viscosity grade of 10 in winter conditions and 30 in summer conditions.
Modern motor oil has polymer additives to keep its viscosity from changing too much at different temperatures.