You measure the sound pressure with a sound pressure level meter (SPL meter).
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That depends how close you measure to the mouth of the human speaker. The closer - the louder! The distance is very important if you measure with a sound pressure level meter. At 1 meter distance the speaker may be measured at 60 decibels SPL.
That depends how close you measure to the bat. The closer - the louder! The distance is very important if you measure with a sound pressure level meter.
Decibels
20 to 50 decibels (dB).
The sound pressure level of 80 dB is a 10 times higher measure than the sound pressure level of 60 dB. Louder ist not the correct word, because it belongs to psycho acoustics and tells the loudness feeling.