Memory Game Properties of MatterOnline version Match each definition with the correct vocabulary word. by Krystin Lawhorn Sulfur Hexafluoride Characteristics or attributes. Density A property of matter that measures how well something can allow electricity to flow through it. Solubility A gas that has no color or smell and is less dense than air. It is often used to make party balloons float. Helium A property of matter that measures how well one thing can dissolve in another. A gas that is six times more dense than air. It is heavy for a gas and a balloon filled with it sinks. Anything that has weight and takes up space. Conductivity Properties Matter A property of matter that measures how close together the particles are inside a substance. This can determine things like if something will float or sink.