When the nightly news comes on, they always tell you that the barometric pressure reading is 30.11 and rising, but what units are they usuing?
2006-09-24 06:08:40 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Weather
That is inches of mercury, or in-Hg. It's a pretty inconvenient unit of measurement, because it's not even derived directly from the already complicated system of customary units. But it's still conventionally used in American weather reports. One inch of mercury is equal to 3386 pascals at 0 degrees Celcius, and normal atomospheric pressure is 29.9 inches of mercury.
2006-09-24 06:10:13 · answer #1 · answered by DavidK93 7 · 0⤊ 0⤋
in-Hg is derived from mm-Hg which is also defined as a Torr.
Standard pressure is 1 atmosphere or:
760 Torr
760 mm-Hg
14.7 psi (lb/in^2)
101.3 kPa
29.92 in-Hg (25.4 mm/inch)
2006-09-24 08:58:37 · answer #2 · answered by Steve S 4 · 0⤊ 0⤋
http://magegame.ru/?rf=c1e0ebe0eaeee2f1eae8e9
2006-09-24 06:11:01 · answer #3 · answered by Kasper u 1 · 0⤊ 0⤋