Millipascal (mPa)
One thousandth of a pascal.
What is a millipascal?
- Symbol
- mPa
- Quantity
- Sound Pressure Level (dB SPL)
- Unit system
- SI
- Definition
- One thousandth of a pascal.
- Exact
- Yes, the value is exact by definition
- Source
- SI Brochure, 9th edition (BIPM, 2019)
Common applications
Used for quiet sound pressures. A pressure of 20 mPa corresponds to 60 dB SPL, about the level of ordinary conversation.
Millipascal in other sound pressure level (db spl) units
- 1 mPa = 0.001 PaPascal
- 1 mPa = 1000 µPaMicropascal
- dB SPL = 20 × log₁₀(mPa ÷ 0.02)Decibel SPL (re 20 µPa)
- dB re 1 µPa = 20 × log₁₀(mPa ÷ 0.001)Decibel re 1 µPa (underwater)
Millipascal quick reference
| Millipascal | Pascal | Decibel SPL (re 20 µPa) | Micropascal |
|---|---|---|---|
| 0.02 mPa | = 0.00002 Pa | = 0 dB SPL | = 20 µPa |
| 0.2 mPa | = 0.0002 Pa | = 20 dB SPL | = 200 µPa |
| 2 mPa | = 0.002 Pa | = 40 dB SPL | = 2000 µPa |
| 20 mPa | = 0.02 Pa | = 60 dB SPL | = 20000 µPa |
| 200 mPa | = 0.2 Pa | = 80 dB SPL | = 200000 µPa |
| 2000 mPa | = 2 Pa | = 100 dB SPL | = 2000000 µPa |
Where the millipascal fits
The next smaller sound pressure level (db spl) unit is the micropascal (µPa). 1 mPa = 1000 µPa, and 1 µPa = 0.001 mPa.
The next larger sound pressure level (db spl) unit is the pascal (Pa). 1 mPa = 0.001 Pa, and 1 Pa = 1000 mPa.