Does compressed air run out if not in use?

[TheHogDog]

So I am thinking of buying compressed air to clean the dust out of my PC when the time comes.

If I were to leave the can without using it, will the compressed air run out over time without use?

 

[ulysses35]

No it wont run out - providing the can doesn't leak it should be fine

 

[PizzaTheHutt]

No, it won't - the air is normally butane which is stuck in the can as a liquid until you pull the trigger to release it.