Convert Torr (torr) to Standard atmosphere (atm) (atm)
Category: Pressure
2.5 torr = 0.003289 atm
High-precision rounding: 6 decimals
How to convert torr to standard atmosphere (atm)
We convert by pivoting through the SI base unit for Pressure and applying exact factors where applicable.
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Examples
Linear unit conversions use standardized factors; many are exact by definition (e.g., 1 in = 25.4 mm, 1 ft = 0.3048 m).
Common mistakes
- Comparing gauge pressure (psig) with absolute pressure (psia/hPa) without converting reference.
- Mixing bar with atm (1 atm = 1.01325 bar).
About Pressure
Pressure is force per unit area. Pascals (and kPa, hPa) are SI, while bar and psi are widely used in engineering and scuba. Conversions must respect absolute vs gauge references when comparing values.
About Torr
Torr
≈133.322 Pa. Preferred in high-vacuum work alongside millitorr and microns.
History: Named after Torricelli; bridges historical millimeters of mercury (mmHg) with SI pascals.
About Standard atmosphere (atm)
Standard atmosphere (atm)
Exactly 101,325 Pa. Reference pressure for chemistry and gas laws; useful for normalizing conditions.
History: A conventional unit set for convenience in calculations and comparative tables.
Related conversions from torr
- torr → bar Bar
- torr → pa Pascal (Pa)
- torr → psi Pounds per square inch (psi)