For the physical meaning of the formula ρ = MV, the correct one in the following description is () A. The density of a substance is directly proportional to its mass. The greater the mass is, the greater the density is. B. the density of a substance is inversely proportional to its volume. The smaller the volume is, the smaller the density is. C. the density of an object composed of the same substance is determined, and has nothing to do with its mass or volume. D. none of the above statements is true

For the physical meaning of the formula ρ = MV, the correct one in the following description is () A. The density of a substance is directly proportional to its mass. The greater the mass is, the greater the density is. B. the density of a substance is inversely proportional to its volume. The smaller the volume is, the smaller the density is. C. the density of an object composed of the same substance is determined, and has nothing to do with its mass or volume. D. none of the above statements is true

For the same substance, under a certain temperature and state, the density is constant, that is, the density of the substance has nothing to do with the mass and volume. It can not be understood that the density of the substance is directly proportional to the mass and inversely proportional to the volume. Therefore, options a, B and D are wrong, and option C is correct