The acoustic variable density is measured in units of?

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Multiple Choice

The acoustic variable density is measured in units of?

Explanation:
Density is mass per unit volume, and in ultrasound acoustics the standard unit is kilograms per cubic meter (kg/m^3). This SI unit keeps typical tissue densities (about 1000 kg/m^3) in a practical range. Using kilograms per cubic centimeter would express densities that are a million times larger than the same value in kg/m^3 (since 1 cm^3 = 1e-6 m^3), which is not how acoustic density is represented in this field. For reference, 1 g/cm^3 equals 1000 kg/m^3, and water is about 1000 kg/m^3. So the appropriate unit is kg/m^3.

Density is mass per unit volume, and in ultrasound acoustics the standard unit is kilograms per cubic meter (kg/m^3). This SI unit keeps typical tissue densities (about 1000 kg/m^3) in a practical range. Using kilograms per cubic centimeter would express densities that are a million times larger than the same value in kg/m^3 (since 1 cm^3 = 1e-6 m^3), which is not how acoustic density is represented in this field. For reference, 1 g/cm^3 equals 1000 kg/m^3, and water is about 1000 kg/m^3. So the appropriate unit is kg/m^3.

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