You have a rock with a volume of 15 cm3 and a mass of 45 g.
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The rock with a volume of 4ml has more mass, assuming all other factors are the same. Mass is directly proportional to volume, so a rock with a larger volume will have more mass.
Density is a measure of how much mass is packed into a certain volume. So, if you increase the mass of an object while keeping its volume constant, the mass is more concentrated in that volume, leading to a higher density.
Mass per volume refers to the amount of mass present in a unit volume of a substance (e.g., kg/L), while volume per mass refers to the amount of volume occupied by a unit mass of a substance (e.g., L/kg). In other words, mass per volume tells you how much mass is in a certain volume, while volume per mass tells you how much volume is taken up by a certain amount of mass.
You seem to be thinking that density is the same as mass, or proportional to mass. That is not the case. Density is mass divided by volume. For example, two objects of the same material have the same density. The larger object will have more mass (in the numerator), but it will also have more volume (in the denominator).
If an object has a greater mass, it is likely to occupy a larger volume as mass and volume are directly related. Objects with greater mass typically have more matter, which requires more space, leading to a larger volume.
Mass is defined as the amount of matter in an object, which is directly proportional to both its volume (amount of space an object occupies) and density (mass per unit volume). Mathematically, mass can be calculated by multiplying density and volume because the more dense an object is for its volume, the more mass it will have.
Mass divided by volume equals density. For the same volume, if the mass is more then the density is higher.
Density is calculated by dividing an object's mass by its volume. The more mass an object has in relation to its volume, the higher its density will be. Conversely, if an object has a larger volume relative to its mass, its density will be lower.
mass and velocitythe object's speed and mass
Density is the property that relates an object's mass to its volume. It is calculated by dividing the mass of an object by its volume. Objects with higher density are more compact and have more mass contained in a specific volume.
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Mass and volume are related through density, which is the amount of mass per unit volume of a substance. An object with a larger volume but the same mass as a smaller object will have a lower density. Conversely, an object with the same volume but more mass will have a higher density.