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