To find the loudness of a sound when you know its intensity, you take the base-10 logarithm of its intensity, over the reference intensity of 1 picowatt per square meter.

要在知道声音强度的情况下求出声音的响度，可以在每平方米 1 皮瓦的参考强度上取其强度的以 10 为底的对数。