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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when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.