Reproduce FO2, nitrogen balance, ppO2 and ppN2 from named analyzed-mixture and ambient absolute-pressure records, then compare two source-owned ppO2 values without selecting limits or approving a dive.
Specialist tool for Scuba Diving1 documented formula2 real workflowsPrivate in your browser
Use this result well
A quick decision brief for this specific tool
Inputs that matter
One de-identified record scope and basis; the explicit binary O2-plus-nitrogen arithmetic model; named analyzed-mixture, ambient-absolute-pressure, externally selected ppO2-comparison and independent-ppO2 records; analyzed O2 percentage; copied ambient ATA; and both copied ppO2 values
Output to expect
FO2, nitrogen-balance fraction, reproduced oxygen and nitrogen partial pressures, their arithmetic sum, signed reproduced-minus-selected-comparison difference and signed reproduced-minus-independent ppO2 difference
How it works
Convert the analyzed O2 percentage to FO2, assign the remainder to nitrogen only under the selected binary model, multiply each fraction by copied ambient absolute pressure and compare reproduced ppO2 with two independently owned records
Confirm analyzer calibration, actual cylinder analysis/label, gas constituents and the exact ambient absolute-pressure basis with the responsible record owner; never substitute target blend, depth, gauge pressure or a silent water/surface-pressure conversion.
The signed differences are transcription/arithmetic checks—not selected oxygen limits, exposure allowance, MOD/EAD/NDL, analyzer/equipment approval or a dive verdict. Apply current training, operator procedures, applicable rules and qualified supervision separately.
Choose your path
Built around the job you need to finish
Reproduce oxygen and nitrogen-balance partial pressures from named analyzed-mixture and ambient-pressure records, then reconcile two externally owned ppO2 comparison records without selecting limits or approving a dive.
Authorized diver checking an analyzed-cylinder record
Confirm that copied FO2 and ambient absolute pressure reproduce the ppO2 already used by a responsible plan without accepting a fill target or cylinder label as analysis.
Name the analyzed-mixture, ambient-pressure, selected-comparison and independent records; copy their values; then inspect FO2, ppO2, ppN2, pressure sum and signed differences.
Can spot an arithmetic or transcription mismatch while analyzer calibration, MOD/exposure, equipment and plan authorization remain with current procedures and supervision.
Instructor reviewing a supervised Nitrox exercise
Teach Dalton-style fraction-times-absolute-pressure arithmetic without presenting an organization-specific oxygen value as a universal recommendation.
Load the de-identified 32%/3 ATA example, explain the binary O2/N2 model and six calculation steps, then change only the independent comparison.
The learner can explain both signed differences and why neither is a within-limit or safe-dive verdict.
Operations reviewer reconciling source records
Keep mixture analysis, pressure basis and externally selected comparison provenance visible in an exportable record rather than receiving a context-free MOD answer.
Use deliberate history, preserve all four source labels, test a positive comparison difference and export the exact record for responsible review.
Receives traceable arithmetic and can route analyzer, gas, exposure, equipment and operational questions back to the accountable process.
Authoritative checks for this tool
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
Copy the oxygen percentage from the named analyzed-mixture or supervised exercise record. A fill target, cylinder marking or remembered blend is not treated as an analyzer result, and this worksheet does not validate calibration or gas quality.
FO2 = analyzed O2% ÷ 100
Explicit binary partial-pressure arithmetic
The selected model assigns the entire non-oxygen balance to nitrogen, so it is not valid for helium or other constituents. Ambient pressure must already be absolute ATA from the named responsible source; no depth, water type or surface pressure is inferred.
ppO2 = FO2 × Pabs; ppN2 = (1 − FO2) × Pabs
Signed record reconciliation
A positive, zero or negative difference identifies agreement direction only. The responsible source still owns the selected comparison, exposure duration, plan, tables, equipment and operational decision; the sign is never a within-limit or go/no-go label.
An instructor provides an analyzed 32.0% O2 exercise record, a separate 3.0 ATA absolute-pressure record, a 1.20 ATA teaching comparison and a 0.95 ATA independent worksheet. The reproduction is 0.96 ATA ppO2, with −0.24 ATA and +0.01 ATA signed differences—arithmetic observations, not exposure approval.
A reviewer copies 36.2% O2 and 2.5 ATA from named records while the independent ppO2 sheet says 0.90 ATA. The reproduced 0.905 ATA leaves a +0.005 ATA difference for record review; the worksheet does not decide whether either source is acceptable.
An operations reviewer has a depth but no documented ambient absolute pressure. They pause rather than entering depth because water type, surface pressure and conversion basis are outside this worksheet; the accountable plan supplies ATA before reconciliation continues.
FAQ
No. Copy the comparison from the current training, operator or responsible-plan record that governs your exact context. The worksheet preserves that provenance and reports only a signed arithmetic difference.
No. Enter copied absolute pressure in ATA. Depth conversion depends on the responsible water and surface-pressure basis; silently applying one feet- or metres-per-atmosphere constant would hide a consequential assumption.
No. Analyzer calibration, analysis procedure, labeling, cylinder contents, gas quality and equipment suitability remain with qualified people and current procedures. This page accepts a copied record; it cannot inspect the physical system.
The selected arithmetic model assumes only oxygen and nitrogen, so FN2 equals 1 minus FO2. Do not use it for helium or any mixture whose remaining constituents are not represented by that binary model.
It only means the reproduced ppO2 is numerically greater than the copied comparison on the entered basis. It does not establish an exposure allowance, maximum depth, decompression status or safe/unsafe decision.
About Reviewed Nitrox Mixture & ppO2 Reconciliation
Use this worksheet after an analyzed-mixture record, ambient absolute-pressure basis and responsible comparison have already been prepared. It preserves those sources, reproduces binary oxygen-plus-nitrogen partial-pressure arithmetic and shows signed differences against selected and independent ppO2 records. It does not convert depth, calculate MOD/EAD/NDL or exposure time, choose an oxygen boundary, validate an analyzer or gas, or authorize a dive.
