The reciprocal of density is called what?

Study for the EPRI Heat Transfer and Fluid Flow Test. Prepare with flashcards and multiple choice questions, each with hints and explanations. Get ready for your exam!

Multiple Choice

The reciprocal of density is called what?

Explanation:
Think about what density measures: mass per unit volume. If you take the inverse, you get volume per unit mass. That quantity is called specific volume. So, v = V/m = 1/ρ. In SI units, it’s typically expressed as cubic meters per kilogram (m^3/kg). Specific volume is useful because it directly links how much space a given amount of material occupies, which helps in calculations involving mass, volume, and state changes. The other properties listed—viscosity (resistance to shear) and thermal conductivity (how well a material conducts heat)—are different physical attributes and are not the reciprocal of density.

Think about what density measures: mass per unit volume. If you take the inverse, you get volume per unit mass. That quantity is called specific volume. So, v = V/m = 1/ρ. In SI units, it’s typically expressed as cubic meters per kilogram (m^3/kg). Specific volume is useful because it directly links how much space a given amount of material occupies, which helps in calculations involving mass, volume, and state changes. The other properties listed—viscosity (resistance to shear) and thermal conductivity (how well a material conducts heat)—are different physical attributes and are not the reciprocal of density.

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