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Hatari
McLeod Gauge
Once a pump has removed most of the air, how do you know how much is left? At a thousandth of an atmosphere a mercury manometer's two columns differ by less than a millimetre, and below that the difference vanishes into the meniscus. Herbert McLeod's answer in 1874 was to stop trying to measure the pressure and instead COMPRESS a known volume of the gas into a tiny capillary, by a known ratio, until its pressure is large enough to read easily. Compress a litre into a cubic millimetre and a pressure a million times too small becomes readable on an ordinary scale. It is a wonderfully direct instrument — it needs no calibration against anything, because Boyle's law and two measured volumes give the answer outright.
Juu
4 hours 30 minutes
Maudhui hatari
Blueprint hii ina taratibu za hatari. Ingia na uwashe maudhui ya hatari katika mipangilio ya akaunti yako ili kuona maagizo ya hatua kwa hatua.
Blueprint zinazohusiana
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CC0 Umma Wote
Mchoro huu umetolewa chini ya CC0. Uko huru kunakili, kubadilisha, kusambaza, na kutumia kazi hii kwa madhumuni yoyote, bila kuomba ruhusa.
Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.