What is a inches of mercury?

Definition
inHg

Inches of mercury (inHg) is used in aviation altimetry and US weather reports, equal to approximately 3,386 pascals.

Unit system
Aviation
All pressure units
UnitSymbolSystem
pascals Pa SI / Metric
kilopascals kPa SI / Metric
megapascals MPa SI / Metric
bar bar SI / Metric
millibars mbar SI / Metric
PSI psi Imperial
atmospheres atm Reference
torr Torr Scientific
mmHg mmHg Medical
inches of mercury inHg Aviation
inches of water inH₂O Engineering