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.
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To calculate the number of decibels that power-level-'A' is greater than power-level-'B',-- Divide 'A' by 'B'-- Take the 'log' of the quotient-- Multiply the 'log' by 10 .If the result is negative, then 'A' is that many decibels lower than 'B'.
Go through the chart at the link below. Scan the whole chart; some levels are described more than once. Normal conversation is about 60 decibels, and ordinary piano practice is between 60 and 70 decibels.
How many times 56 is larger than 5,6
He is snoring louder than a bear. Resting quieter than a baby after she is fed.
How many times greater is five thousand than fifty