A tyre pressure of 32 PSI in bar
32 PSI × 0.0689476 = 2.206 bar.
Pressure & energy unit converter
Result
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How it works
Pressure units split into two families: SI-derived ones (pascal, bar) and the imperial PSI, plus a few defined by physical reference (the standard atmosphere, a column of mercury). All are exact multiples of the pascal.
Energy units span an enormous range: the electronvolt describes single-particle physics, the joule and kilojoule cover everyday mechanics, and the kilowatt-hour is how electricity is billed. They are all exact multiples of the joule, so converting between them is a single multiplication.
Formulas used
Direct conversion
value in target unit = value × (target unit per source unit)
- ×
- A fixed, exact multiplication factor for the chosen pair of units
Worked examples
A 5 kWh home battery in megajoules
5 kWh × 3.6 = 18 MJ.
Assumptions and limits
- Pressure values are gauge-agnostic: convert the number as given, whether it is absolute or gauge pressure.
- The mercury-column units (mmHg, inHg) use the conventional definition at standard gravity, not a temperature-corrected one.
Frequently asked questions
Why does 1 atm not equal exactly 1 bar?
The bar was defined later (1 bar = 100,000 Pa exactly) as a round SI-derived unit, while the standard atmosphere was fixed historically at 101,325 Pa from mean sea-level pressure. The two are close (about 1.3% apart) but not identical.
What is an electronvolt used for?
It is the energy an electron gains crossing a 1-volt potential difference — convenient for particle and atomic physics, where a joule would require an inconveniently tiny number. 1 eV ≈ 1.602 × 10⁻¹⁹ J.
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