What's the relationship between the temperature and the density of a substance?

When you increase the temperature of a substance its volume increases.(This is also known as Charles law~> T and V are directly correlated)

When the substances volume increases its density decreases.

Density:Mass/Volume

Hope this helps:)

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the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.