Accurately correct your barometer readings for temperature variations. Our easy-to-use calculator applies the standard formula to compensate for the thermal expansion of mercury and the instrument's brass scale, ensuring precise atmospheric pressure data. Essential for meteorology, research, and hobbyists needing accurate environmental measurements.
Formula:
The calculator uses the formula for temperature correction of a mercury barometer with a brass scale:
Pcorrected = Pobserved × [1 − (αHg − αBrass) × (Tobserved − Treference)]
Where:
- Pcorrected: The corrected barometric pressure.
- Pobserved: The observed (uncorrected) barometric pressure reading from the instrument.
- αHg: The coefficient of thermal expansion of mercury (approximately 0.0001818 per °C).
- αBrass: The coefficient of linear expansion of the brass scale (approximately 0.0000187 per °C).
- Tobserved: The observed temperature of the barometer in degrees Celsius (°C).
- Treference: The reference temperature (the temperature at which the barometer was calibrated), typically 0°C for mercury barometers.
The difference (αHg − αBrass) is approximately 0.0001631 per °C.