Ah, what a lovely question! The unit of amplitude is not the same as that of density and pressure. Amplitude is measured in units like meters or centimeters, while density is measured in kilograms per cubic meter and pressure is measured in pascals. Each of these units helps us understand different aspects of the world around us, like the gentle sway of trees, the compactness of a material, or the force exerted on an object.
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Density isn't determined by the size of the specimen but by its mass per unit of volume. An oak branch has the same density as the whole tree it came from--the weights are vastly different, but density is the same.
As radio frequency, in would be modulation in hertz, kilohertz, megahertz. In other areas of measure it could be peak-to-peak. I.E. the maximum absolute value of some quantity that varies, usually with regular frequency. The unit of amplitude depends specifically on the type of wave, certain mechanical waves (e.g. those in in a plucked guitar string) have amplitudes measured in metres. Pressure waves (such as sound) have the unit of pressure as their amplitude (Pascals) where as electromagnetic waves use the electric field strength in volts/metre as the unit of amplitude. As you look at an oscilloscope, the vertical peak of a waveform From Wikipedia: The maximum absolute value of the vertical component of a curve or function, especially one that is periodic.
That depends what aspect of the gas you want to measure: its volume, its pressure, its temperature, its density, etc.
density= mass/volume
Tesla.