pascal
Papressure · International · Modern
SI derived unit of pressure and stress; 1 Pa = 1 N/m² = 1 kg·m⁻¹·s⁻².
Converter
pressure · International · Modern
standard atmosphere
exact
- Record
- M319
- Definition quality
- Exact by definition
- Conversion mode
- multiplicative
- Calculator
- Fully calculable
Definition
1 atm = 101325 Pa exactly
Reference value
One standard atmosphere is exactly 101,325 pascals.
History & use
The 10th CGPM adopted the standard atmosphere for general use in 1954, defining it as 1,013,250 dynes per square centimetre, equivalent to 101,325 N/m².
Modern use
Modern use is context-dependent and varies by region or measurement system.
Sources & evidence
Source tier — · confidence high
Related measurements
bar
barpressure · International · Modern / historical
1 bar = exactly 100,000 Pa.
pressure · United States · Modern
1 psi = exactly 6894.757293168361 Pa using international lb/in and standard gravity.
pressure · Scientific/technical · Modern/historical
1 Torr = (1/760) atm = 101325/760 Pa
pressure · Medical/scientific/technical · Modern
1 mmHg (conventional) = 133.3224 Pa
pressure
1 hPa = 100 Pa; conventional inHg converts using NIST factors.