Question

Why is sound measured in dB?

Answer 1

The decibel was first used to evaluate transmission loss and power in telephony in the early twentieth century in the United States by the Bell System. Although the bell was named after Alexander Graham Bell, it is rarely used. Instead, the decibel is used in science and engineering for a wide range of measures, most notably in acoustics, electronics, and control theory. Amplifier gains, signal attenuation, and signal-to-noise ratios are frequently represented in decibels in electronics.

Complete answer:
Decibels are the units used to measure sound intensity (dB). Decibels are not the same as other conventional measuring units. The decibel scale is a logarithmic scale. Consider an 80-foot-tall structure to better comprehend what we're talking about. Using linear measurement, we can see that it is somewhat taller if we add another 10 feet on top of it. Consider another example: if a sound is 80 decibels and we add another 10 decibels, the sound will be ten times more powerful and seem to our ears to be roughly twice as loud.
Because our perception of sound level (volume) is not proportional to the amount of energy present in the air. This was found by Alexander Graham Bell while attempting to comprehend hearing and hearing problems, and it is from this that the name Bel was derived. Because the Bel is such a big number, the decibel ( $\dfrac{1}{10}$ of a Bel) was invented. He discovered that human sense of loudness follows a logarithmic rather than a linear trend. To put it another way, most people only notice a minor variation in volume when the power of a sonic signal in the air is doubled.
A decibel is a log, or more precisely, a log's multiple. A log of a number is the power of 10 that must be multiplied by that number to equal that number. For example, the log of 100 is 2, 1000 is 3, 10000 is 4, and so on. As you can see, as you count to five in "logs," the actual numbers covered grow exponentially. $\text{Number of dBs = }\dfrac{\text{10 x Log of a power}}{\text{A power reference}}$ is the definition of a dB.

Note:
The need for a unit to assess the transmission efficiency of telephone infrastructure has been recognised since the invention of the telephone. The development of cable in 1896 provided a firm foundation for a practical unit, and the "mile of standard" cable became widely used soon after. This device was used until 1923, when it was replaced with a new unit that was better suited to contemporary telephone work. The new transmission unit is extensively utilised by international telephone companies, and it was recently given the name "decibel" by the International Advisory Committee on Long Distance Telephony.