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It can be the power ratio.

If you measure voltage or sound pressure it is not the power ratio.

Q: Is Decibel is the unit of power ratio?

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Decibel is no real unit, it is a pseudo unit. The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity. A change in voltage ratio by a factor of two is approximately a 6 dB change. A change in power ratio by a factor of two is approximately a 3dB change.

The ratio between two quantities, usually quantities that somehow measure power, or intensity (power / area).

A tenth of a bel. It's a ratio of two values of the same unit.

No. It's the log of the ratio of two power levels. It a magnitude without a direction.

A unit of power or intensity equal to one tenth of a bel is a decibel.

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Decibel is no real unit, it is a pseudo unit. The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity. A change in voltage ratio by a factor of two is approximately a 6 dB change. A change in power ratio by a factor of two is approximately a 3dB change.

The ratio between two quantities, usually quantities that somehow measure power, or intensity (power / area).

No. A decibel is one tenth of a bel. The decibel is a logarithmic unit of measurement that expresses the magnitude of a physical quantity relative to a specified reference level. It is a dimensionless unit, because it expresses a ratio of two quantities with the same unit.

A unit used to express relative difference in power or intensity, usually between two acoustic or electric signals, equal to ten times the common logarithm of the ratio of the power out to power in.

The decibel (db) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level

A decibel is one tenth of a bel. The decibel, short dB, is a logarithmic unit of measurement that expresses the magnitude of a physical quantity relative to a specified or implied reference level. It expresses a ratio of two quantities with the same unit. That is why it is a dimensionless unit.

A tenth of a bel. It's a ratio of two values of the same unit.

Generally power is expressed in watts. The gain is the ratio of the output power to the input power. Gain = (output power)/(input power) if the gain is expressed in terms of log(base10) it is known as Decibel power gain Decibel power gain = Log10(Gain)dB if 1milliwatt power is taken as reference then Decibel power gain = Log10(Output power/1 milliwatt)dBm

Decibels (dB) mean a logarithmic unit of measurement that expresses the magnitude of a physical quantity relative to a specified or implied reference level. Since it expresses a ratio of two quantities with the same unit, it is a dimensionless unit. Decibel is Decibel!

The decibel is used to measure sound level, but it is also used in electronics, signals and communication. The dB is a logarithmic unit used to describe a ratio. It is no unit. The ratio may be power, sound pressure, voltage or intensity or several other things. Also units related to loudness like the phon and the sone have a connection to the decibel. Look at the link: "The Relation of Sound Quantities - their Levels and References".

No. It's the log of the ratio of two power levels. It a magnitude without a direction.

A unit used to measure the intensity of a sound or the power level of an electrical signal. Someones voice could raise by a decibel.