In physical science, an atom's central region, which is made up of protons and neutrons.
In a solution, the substance in which the solute dissolves.
A region around the nucleus of an atom where electrons are likely to be found.
The sum of the number of protons and neutrons.
The resistance of a gas or liquid to flow.
The knowledge obtained by observing natural events and conditions in order to discover facts and formulate laws or principles that can be verified or tested.
In a solution, the substance that dissolve in the solvent.
The conversion of a liquid to a vapor when the vapor pressure of the liquid equals the atmospheric pressure.
A characteristic of a substance that does not involve a chemical change, such as density, color, or hardness.
The physical forms of matter, which include solid, liquid, and gas.
A measure of the gravitational force on an object
A subatomic particle that has a positive charge and that is found in the nucleus of an atom.
The force that acts on the surface of a liquid and that tends to minimize the area of the surface.
The mass of an atom expressed in atomic mass units.
A substance that cannot be separated or broken down into simpler substances by chemical means.
The curve at a liquid's surface by which one measures the volume of the liquid.
The change of a substance from a liquid to a gas.