Calculator Inputs
Example Data Table
| Scenario | Inputs | Outputs |
|---|---|---|
| Ambient air conversion | 65 ppb at 25°C, 101.325 kPa | 127.5 µg/m³ |
| Mass to mixing ratio | 120 µg/m³ at 25°C, 101.325 kPa | 61.16 ppb |
| Dissolved ozone from UV | A=0.250, ε=2950 L·mol⁻¹·cm⁻¹, l=1 cm | 4.068 mg/L |
Formula Used
How to Use This Calculator
- Choose the method that matches your measurement.
- Enter temperature and pressure for air-based conversions.
- Fill in the method-specific fields below the divider.
- Set significant figures and an optional alert threshold.
- Press Submit to show results above the form.
- Use CSV or PDF buttons to export your summary.
Measurement paths supported
Use this calculator when you have ozone readings in different forms. Select Gas mixing ratio for direct ppb or ppm inputs from monitors. Choose Mass concentration for µg/m³ or mg/m³ in air, or mg/L in water. UV absorbance applies Beer–Lambert inputs (A, ε, l) for lab checks. Moles and volume supports chamber dosing and bag sampling. All paths normalize results with a consistent standard molar mass, 48 g/mol.
Air conversion behavior with temperature and pressure
Air conversions rely on the ideal gas relation, so temperature and pressure matter. At 25°C and 101.325 kPa, 65 ppb corresponds to about 127.53 µg/m³ in this tool. If the same 65 ppb occurs at 35°C, the mass concentration drops to roughly 123.39 µg/m³ because warmer air is less dense. Lower pressure also reduces µg/m³ for a fixed ppb value. Always record sampling conditions.
Beer–Lambert workflow for solution tests
Beer–Lambert calculations convert absorbance into concentration using c = A/(ε·l). For a cuvette path length of 1 cm, absorbance A=0.250, and ε=2950 L·mol⁻¹·cm⁻¹, the computed concentration is 8.47×10⁻⁵ mol/L. With ozone molar mass 48 g/mol, that equals about 4.07 mg/L. Use an ε value that matches your wavelength, instrument bandpass, and matrix. Dilute samples if absorbance exceeds 1.0 often.
Interpreting the output set
This calculator reports multiple representations to support engineering and laboratory notes. For gas results, it outputs ppb, ppm, µg/m³, mg/m³, mol/m³, partial pressure, and number density in molecules/cm³. For example, 120 µg/m³ at 25°C and 101.325 kPa converts to about 61.16 ppb. If you enter ppb directly, the tool back-computes mol/m³ and mass units automatically, keeping significant-figure rounding consistent. Use this for cross-checks.
Export-ready record keeping
After each submission, results appear above the form for quick review, and the latest summary is stored for export. CSV downloads create a two-column Field/Value file that fits most lab notebooks and LIMS imports. PDF downloads generate a single-page text report for attachments and approvals. For repeat studies, keep temperature, pressure, method, and ε values aligned across samples. Adjust significant figures to match instrument precision and reporting standards without manual retyping.
FAQs
Use Gas mixing ratio for monitor readings in ppb or ppm. Use Mass concentration when you have µg/m³, mg/m³, or mg/L. Use UV absorbance for spectrophotometer checks. Use Moles and volume for dosing or chamber work.
µg/m³ reflects mass per air volume. For a fixed ppb, changing temperature or pressure changes air number density via PV=nRT. The calculator uses your inputs to keep conversions physically consistent.
Yes. Choose Mass concentration, set Medium to Water, and enter mg/L, or choose UV absorbance with Sample type Solution. The tool outputs mol/L and mg/L for solution-mode calculations.
Enter the molar absorptivity used by your method at the selected wavelength and optical path. Values can differ by instrument bandwidth and matrix. Keep ε consistent with your calibration and standard operating procedure.
The calculator rounds displayed results to your selected significant figures while keeping internal calculations in full precision. Choose a setting that matches instrument uncertainty and reporting requirements.
After a successful submit, the latest result is stored for download. CSV exports Field/Value pairs for spreadsheets. PDF exports a simple single-page text summary, designed to be lightweight and dependency-free.