Calculadora de Nivel de Pressao Sonora — Formula
## Sound Pressure Level (SPL)
SPL quantifies the RMS sound pressure relative to the threshold of hearing on a logarithmic scale.
### Formula
**SPL = 20 * log10(p / p_0)**
where p_0 = 20 micro-Pa = 2 x 10^-5 Pa is the reference pressure corresponding to the threshold of human hearing at 1 kHz.
SPL quantifies the RMS sound pressure relative to the threshold of hearing on a logarithmic scale.
### Formula
**SPL = 20 * log10(p / p_0)**
where p_0 = 20 micro-Pa = 2 x 10^-5 Pa is the reference pressure corresponding to the threshold of human hearing at 1 kHz.
Exemplo Resolvido
A sound wave with RMS pressure of 1 Pa.
- SPL = 20 * log10(p / p_0)
- SPL = 20 * log10(1 / 0.00002)
- SPL = 20 * log10(50000)
- SPL = 20 * 4.699 = 94.0 dB SPL