Aerogels are very low density materials that contain numerous minute air-filled cavities. Including the air trapped in its microscopic pores, a certain aerogel has an average density of 2. 3 kg/m^3. A cube of this material is 5.08 cm on a side, is suspended in air (density of 1.2 kg/m^3) by a vertical string. What is the tension in the string? a. 1.4 x 10^-4 N b. 1.8 x 10^-3 N c. 2.1 x 10^4 N d. 1.4 x 10^-3 N

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Density of Solids

The density of a substance refers to how much matter is present in a given amount of space. It is expressed as the ratio of the mass of the substance to its volume.