Explain factor affecting stability of alkene

Alkenes have substituents, hydrogen atoms attached to the carbons in the double bonds. The more substituents the alkenes have, the more stable they are. Thus, a tetra substituted alkene is more stable than a tri-substituted alkene, which is more stable than a di-substituted alkene or an unsubstituted one.

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

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