Convert Inches of Water to Torr
Convert Inches of Water (inH₂O) to Torr (Torr) instantly and accurately.
Conversion Formula
Torr = inH₂O × 1.86832047
About Inches of Water
One inch of water column (inH₂O or in WC) = pressure from 1 inch of fresh water at standard gravity ≈ 249.09 Pa. The standard unit for low-pressure measurement in US HVAC and plumbing: ductwork static pressure, fan performance, filter ratings, and gas appliance manifold pressures are all specified in inches WC. Household natural gas supply pressure is typically 7 in WC (0.25 psi). Blower door tests for building air-tightness use 50 Pa ≈ 0.2 in WC test pressure. 1 inH₂O = 249.089 Pa.
About Torr
The torr is defined as exactly 1/760 of a standard atmosphere ≈ 133.322 Pa - effectively replacing mmHg with an exact definition. Named after Evangelista Torricelli (1608-1647), inventor of the barometer. Vacuum science universally uses torr: rough vacuum 760-1 torr; medium vacuum 1-10⁻³ torr; high vacuum 10⁻³-10⁻⁷ torr; ultra-high vacuum below 10⁻⁹ torr. UHV systems for surface science, particle accelerator beam tubes, and space simulation chambers reach 10⁻¹¹-10⁻¹² torr. 1 torr = 133.322 Pa.
Quick Reference Table
| Inches of Water (inH₂O) | Torr (Torr) |
|---|---|
| 1 inH₂O | 1.86832 Torr |
| 2 inH₂O | 3.73664 Torr |
| 5 inH₂O | 9.3416 Torr |
| 10 inH₂O | 18.6832 Torr |
| 25 inH₂O | 46.708 Torr |
| 50 inH₂O | 93.416 Torr |
| 100 inH₂O | 186.832 Torr |