If a pressure gauge is calibrated to read zero in space, then at sea level on Earth it would read 14.7 psi. Humans do not feel this pressure because internal pressure of liquid in their bodies matches the external pressure.
At sea level, Earth's atmosphere actually exerts a pressure of 14.7 psi. Psia (pound-force per square inch absolute)is a unit of pressure pressure relative to a vacuum (such as that in space). Thus a reading of 30 psig, on Earth, on a tire gauge represents an absolute pressure of 44.7 psi
Psig (pound-force per square inch gauge) is a unit of pressure relative to the surrounding atmosphere. Megabecquerel: 106 Bq1 Bq is defined as the activity of a quantity of radioactive material in which one nucleus decays per second.Ī unit of mass defining the total number of kilograms after deductions.Ī unit of proportion equal to 10-6 (ppm).Ī unit of count defining the number of batches (batch: quantity of material produced in one operation or number of animals or persons coming at once). This is often abbreviated to just "dB" however the correct abbreviation is dB(SPL), indicating decibel for Sound Pressure Level.Ī unit of information equal to 10³ (1000) bytes.Ī micrometre is one millionth of a metre, also termed Micron.Ī unit of information equal to 10 (1000000) bytes. This is roughly the sound of a mosquito flying 3 metres away. The number of centimetre per second the trade item or part of the trade item moves.Ī measurement for sound in air and other gases, relative to 20 micropascals (μPa) = 2×10−5 Pa, the quietest sound a human can hear. A unit of pressure equal to 9.80665*10-05 Bar
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