Decibel re 1 µPa (underwater) (dB re 1 µPa)
Sound pressure level in water and other media: 20 times the base-10 logarithm of the RMS sound pressure divided by the reference pressure of 1 µPa. The same sound reads about 26 dB higher than in dB SPL.
What is a decibel re 1 µPa?
- Symbol
- dB re 1 µPa
- Quantity
- Sound Pressure Level (dB SPL)
- Unit system
- other
- Definition
- Sound pressure level in water and other media: 20 times the base-10 logarithm of the RMS sound pressure divided by the reference pressure of 1 µPa. The same sound reads about 26 dB higher than in dB SPL.
- Exact
- Yes, the value is exact by definition
- Source
- ISO 1683:2015, Acoustics: Preferred reference values for acoustical and vibratory levels
Common applications
Used in underwater acoustics for sonar, ship noise and the sounds of marine animals. The same pressure reads about 26 dB higher than in dB SPL.
Decibel re 1 µPa (underwater) in other sound pressure level (db spl) units
- Pa = 0.000001 × 10^(dB re 1 µPa ÷ 20)Pascal
- mPa = 0.001 × 10^(dB re 1 µPa ÷ 20)Millipascal
- µPa = 10^(dB re 1 µPa ÷ 20)Micropascal
- dB SPL = dB re 1 µPa − 26.02059991Decibel re 1 µPa (underwater) to Decibel SPL (re 20 µPa) converter
Decibel re 1 µPa (underwater) quick reference
| Decibel re 1 µPa (underwater) | Decibel SPL (re 20 µPa) | Pascal | Millipascal |
|---|---|---|---|
| 0 dB re 1 µPa | ≈ -26.02059991 dB SPL | = 0.000001 Pa | = 0.001 mPa |
| 20 dB re 1 µPa | ≈ -6.020599913 dB SPL | = 0.00001 Pa | = 0.01 mPa |
| 40 dB re 1 µPa | ≈ 13.97940009 dB SPL | = 0.0001 Pa | = 0.1 mPa |
| 60 dB re 1 µPa | ≈ 33.97940009 dB SPL | = 0.001 Pa | = 1 mPa |
| 80 dB re 1 µPa | ≈ 53.97940009 dB SPL | = 0.01 Pa | = 10 mPa |
| 100 dB re 1 µPa | ≈ 73.97940009 dB SPL | = 0.1 Pa | = 100 mPa |