Starting gauge pressure
Mistake: Multiplying gauge pressure directly by a temperature ratio.
Fix: Add ambient pressure first to obtain absolute pressure; subtract it at the end.
Calculators · Free
Nitrogen pressure temperature worksheet
This offline tool calculates the result from measured inputs. Nitrogen pressure temperature worksheet.
01Enter your values
Runs in your browserRuns offline in your browser. Once the page and required files have loaded, processing needs no internet.
02Nitrogen pressure temperature worksheet
Runs in your browser
How it works
This offline tool calculates the result from measured inputs. Nitrogen pressure temperature worksheet.
Pg2 = (Pg1 + Pa) × (T2 + 273.15)/(T1 + 273.15) − Pa; difference = measured − Pg2
Approximate ideal-gas model with unchanged gas amount and volume only. A difference cannot establish a leak, safety or compliance; measure gas temperature and separately measure ambient pressure if it changes between readings.
Your data stays yours
Inputs are processed on this page and are never sent to a server.
About this tool
Use tool ↑This offline tool calculates the result from measured inputs. Nitrogen pressure temperature worksheet.
For nitrogen at fixed volume, add ambient pressure to gauge pressure. Multiply this absolute pressure by the ratio of absolute temperatures, then subtract ambient pressure. If a later gauge reading is given, show its difference from the prediction.
How to use it
- Enter your values
Starting gauge pressure · Starting temperature · Later temperature · Ambient pressure · Measured later pressure
- Calculate / generate
This offline tool calculates the result from measured inputs. Nitrogen pressure temperature worksheet.
- Result
Expected later pressure: 10.375687 bar Temperature-only change: 0.37568651 bar Measured difference: 0.024313491 bar
Calculation method
- For nitrogen at fixed volume, add ambient pressure to gauge pressure.
- Multiply this absolute pressure by the ratio of absolute temperatures, then subtract ambient pressure.
- If a later gauge reading is given, show its difference from the prediction.
Pg2 = (Pg1 + Pa) × (T2 + 273.15)/(T1 + 273.15) − Pa; difference = measured − Pg2
Nitrogen pressure temperature worksheet
- Starting gauge pressure
- 10 bar
- Starting temperature
- 20 °C
- Later temperature
- 30 °C
- Ambient pressure
- 1.01325 bar
- Measured later pressure
- 10.4 bar
Result
Expected later pressure: 10.375687 bar Temperature-only change: 0.37568651 bar Measured difference: 0.024313491 bar
Frequently asked questions
What does this result cover?
Approximate ideal-gas model with unchanged gas amount and volume only. A difference cannot establish a leak, safety or compliance; measure gas temperature and separately measure ambient pressure if it changes between readings.
Where does my data go?
Calculations run on your device. Form inputs are not sent to a server.
Terms and definitions
Enter your values
- Measurement system
The initial choice follows your browser region. Your choice is remembered on this device. Gallons are US gallons. Switching units keeps your numbers unchanged and interprets them in the new unit.
Numbers stay unchanged. Check the new unit and enter the intended measurement, or select an example for that system.
- Starting gauge pressure
Use this value with the unit and scope defined in the method. Starting gauge pressure (Pg1).
Enter a numerical value for this quantity. Use the unit shown beside this field. bar / psi
Minimum: 0 · Maximum: 30 bar
- Starting temperature
Use this value with the unit and scope defined in the method. Starting temperature (T1).
Enter an absolute temperature, not a temperature rise. Use the unit shown beside this field. °C / °F
Minimum: -50 · Maximum: 80 °C
- Later temperature
Use this value with the unit and scope defined in the method. Later temperature (T2).
Enter an absolute temperature, not a temperature rise. Use the unit shown beside this field. °C / °F
Minimum: -50 · Maximum: 80 °C
- Ambient pressure
Use this value with the unit and scope defined in the method. Ambient pressure (Pa).
Enter a numerical value for this quantity. Use the unit shown beside this field. bar / psi
Minimum: 0.5 · Maximum: 1.2 bar
- Measured later pressure
Use this value with the unit and scope defined in the method. Measured later pressure (Pg2).
Enter a numerical value for this quantity. Use the unit shown beside this field. bar / psi
Minimum: 0 · Maximum: 30 bar
Result
- Result
For nitrogen at fixed volume, add ambient pressure to gauge pressure. Multiply this absolute pressure by the ratio of absolute temperatures, then subtract ambient pressure. If a later gauge reading is given, show its difference from the prediction.
Calculated from your entries using the method below.
- Expected later pressure
For nitrogen at fixed volume, add ambient pressure to gauge pressure. Multiply this absolute pressure by the ratio of absolute temperatures, then subtract ambient pressure. If a later gauge reading is given, show its difference from the prediction.
Calculated from your entries using the method below.
- Temperature-only change
For nitrogen at fixed volume, add ambient pressure to gauge pressure. Multiply this absolute pressure by the ratio of absolute temperatures, then subtract ambient pressure. If a later gauge reading is given, show its difference from the prediction.
Calculated from your entries using the method below.
- Measured difference
Approximate ideal-gas model with unchanged gas amount and volume only. A difference cannot establish a leak, safety or compliance; measure gas temperature and separately measure ambient pressure if it changes between readings.
Calculated from your entries using the method below.
- Value
For nitrogen at fixed volume, add ambient pressure to gauge pressure. Multiply this absolute pressure by the ratio of absolute temperatures, then subtract ambient pressure. If a later gauge reading is given, show its difference from the prediction.
Calculated from your entries using the method below.
- Unit
For nitrogen at fixed volume, add ambient pressure to gauge pressure. Multiply this absolute pressure by the ratio of absolute temperatures, then subtract ambient pressure. If a later gauge reading is given, show its difference from the prediction.
Calculated from your entries using the method below.
Common mistakes and quick fixes
Limits and key assumptions
- Approximate ideal-gas model with unchanged gas amount and volume only. A difference cannot establish a leak, safety or compliance; measure gas temperature and separately measure ambient pressure if it changes between readings.
- Displayed results may be rounded; rounding does not add measurement precision.