Will it?

For an experiment, a chemistry teacher takes out a $20 bill and put it's in a bottle of ethanol. He then asks his students if it will dissolve.

A student raised his hand to answer. Student: 'No, it most definitely will not dissolve, sir.'

Teacher: 'Really good! Now can you explain to the rest of the class why?'

Student:

Spoiler:

'You're so tight, there's no way you would've sacrificed that $20!!'