1 Standard Atmosphere = 760 Torr | 1 Torr = 0.0013157895 atm
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Non-SI pressure unit (1 Torr ≈ 1 mmHg) | Used for lab vacuum systems, meteorology, barometry
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Torr → atm: atm = Torr ÷ 760 (exact, 1 atm = 760 Torr)
atm → Torr: Torr = atm × 760
Precision: 1 Torr = 0.0013157894736842 atm (1/760)
The 1:760 ratio comes from historical barometry: 1 standard atmosphere was originally defined as the pressure exerted by a 760 mm column of mercury (Hg) at 0°C and standard gravity. Since 1 Torr is defined as the pressure of 1 mm Hg, this directly establishes 1 atm = 760 Torr. The ratio is exact for pressure unit conversion (search results 3, 5, 6).
Historically, 1 Torr was intended to equal 1 mmHg (millimeter of mercury), but modern definitions have minor differences:
Use cross-unit factors derived from search results (6):
1 Torr = 133.322 Pa = 0.133322 kPa = 0.0193368 psi
Example: 500 Torr = 500 × 0.133322 = 66.661 kPa = 500 × 0.0193368 = 9.6684 psi
Torr is more precise for low-pressure measurements (common in labs):
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