Which is a measure of how closely particles are packed together?

A.density C.solubility
D.volume B.matter

The best answer is density.

The answer is A. densitiy

density

Density

Volume

The measure of how closely particles are packed together is called density. Density refers to the amount of mass (or "stuff") that is present in a given volume. It is a property of matter and is commonly expressed in units such as grams per cubic centimeter (g/cm³) or kilograms per liter (kg/L). The higher the density, the more closely packed the particles are in a substance.

To determine the density of a substance, you need to know its mass and volume. The mass can be measured using a balance, and the volume can be determined using various techniques depending on the shape of the object. For example, the volume of a regular-shaped solid (like a cube or a cylinder) can be calculated using mathematical formulas, while the volume of an irregular-shaped object can be determined by water displacement method or using instruments like a graduated cylinder.

Once you have obtained the mass and volume of a substance, you can calculate the density by dividing the mass by the volume. The formula for density is:

Density = Mass / Volume

By measuring the density, you can determine how closely packed the particles are in a substance, whether it is a solid, liquid, or gas.