Whats the liquid for Speedo?

It's glycerin. You can buy it at any drug store.

Cigdaze is this the truth, i know how you chemical or space engineers like to meke techinical jokes that fly over us normal peoples head

also, can i fill it to the top or do i need to leave an air bubble, does the liquid expand at all with different temperatures?
 
Why pay 10 times more for it at Livorsi, when you can by it at any corner drug store, and get it in 15 minutes? Yes, its glycerin.
 
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