Mercurial Barometer Temperature Correction Calculator
Mercury-barometer column reduction using independent mercury and scale expansion coefficients, same reference temperature; gravity/index corrections not included. Caller independently establishes matching units, evidence, method edition and applicability; output is not compliance, diagnosis, work-safety approval, geological identity or validated hazard prediction.
Description
A mercury barometer's column and graduated scale respond differently to temperature.
A mercury barometer's column and graduated scale respond differently to temperature.1
Reducing a reading to a chosen reference temperature requires both expansion coefficients.
When to use Mercurial Barometer Temperature Correction Calculator
Use this tool to calculate or review the supplied observations under the stated rules. Establish the observation method, units, averaging period and applicable reference or calibration.
How to use Mercurial Barometer Temperature Correction Calculator and understand its results
- Establish the observation method, units, averaging period and applicable reference or calibration.
- Enter observedColumnMm, observedTemperatureC, callerReferenceTemperatureC, callerMercuryExpansionPerC, callerScaleExpansionPerC, using the field meanings and rules below, then run the tool.
- Read temperatureReducedColumnMm, using the output meanings and calculation rules below.
- Correct any reported input issue and run again. Before using a successful result, check the stated units, signs, reference scope and observation coverage.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| observedColumnMm | Observed column mm | number | Required |
| observedTemperatureC | Observed temperature c | number | Required |
| callerReferenceTemperatureC | Caller reference temperature c | number | Required |
| callerMercuryExpansionPerC | Caller mercury expansion per c | number | Required |
| callerScaleExpansionPerC | Caller scale expansion per c | number | Required |
Require a positive observed column and nonnegative mercury and scale expansion coefficients. Compute the signed observed-minus-reference temperature difference. Both 1+coefficient×difference factors must remain strictly positive; multiply the column by the scale factor and divide by the mercury factor.
referenceColumn=observedColumn×(1+scaleExpansion×ΔT)/(1+mercuryExpansion×ΔT) Use the matching field units and the exact boundary, ordering and reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| temperatureReducedColumnMm | Temperature reduced column mm | number |
{
"input": {
"observedColumnMm": 100,
"observedTemperatureC": 20,
"callerReferenceTemperatureC": 0,
"callerMercuryExpansionPerC": 0.0002,
"callerScaleExpansionPerC": 0.00001
},
"output": {
"temperatureReducedColumnMm": 99.6215139442231
}
}Limitations and assumptions
The result is only this temperature reduction. It does not apply gravity, capillarity, instrument zero or other barometric corrections.
Missing required fields, unknown fields, wrong types and violated rules return input issues. Numeric values and outputs must be finite.
Alternative or Complementary methods
For a related step, use Record vs Normal Spread Z Checker: A standardized anomaly expresses an observation's departure from a reference mean in units of reference standard deviation. For a complementary comparison, use Climate Normals Anomaly Deviation Calculator: A climate anomaly is the difference between an observation and a matched normal.
References
Similar or alternative tools
- Record vs Normal Spread Z Checker
A standardized anomaly expresses an observation's departure from a reference mean in units of reference standard deviation.
- Climate Normals Anomaly Deviation Calculator
A climate anomaly is the difference between an observation and a matched normal.