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body mass
This term is primarily used in clinical, biological, and athletic contexts to describe the physical quantity of a body. While often used interchangeably with weight in casual conversation, in scientific settings it specifically refers to the amount of matter regardless of gravity, making it a more precise term for physiological measurements.
In medical discourse, the term is most frequently encountered as a component of the Body Mass Index (BMI). Because it refers to a measurable quantity of matter, it is treated as an uncountable noun; one does not refer to multiple body masses for a single individual, but rather to the measurement of their mass.