Pressure is measured with a barometer or a manometer.
The legal unit of pressure is the pascal (symbol Pa).
Other units are often used : the bar and the hectopascal.
1 bar = 1,000 hPa and 1 hPa = 100 Pa
Pressure is measured with a barometer or a manometer.
The legal unit of pressure is the pascal (symbol Pa).
Other units are often used : the bar and the hectopascal.
1 bar = 1,000 hPa and 1 hPa = 100 Pa
| P (hPa) | 2,067 | 1,537 | 1,016 | 759 | 605 | 504 |
| V (cm3) | 15 | 20 | 30 | 40 | 50 | 60 |
A gas is compressible because its volume decreases when pressure increases.
A gas is expandable because its volume increases when pressure decreases.
| P (hPa) | 2,000 | 1,750 | 1,500 | 1,300 | 1,150 | 1,000 |
| V (cm3) | 30 | 30 | 30 | 30 | 30 | 30 |
A liquid is not compressible because its volume does not change when pressure increases ✅.
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