You can tap your available balance, not your account balance. The money in your bank account is yours, but you can't always spend it when you want to. You may already have noticed that the account balance and available balance on your ATM receipts or online bank statement sometimes give you different figures.
How many drops of water of volume and capacity system are in 1 milliliter? The answer is: The change of 1 ml ( milliliter ) unit for a volume and capacity measure equals = into 20.00 drop - gtt SI ( drop of water ) as per its equivalent volume and capacity unit type measure often used.
I have tested a few different droppers and transfer pipettes (putting a fixed number of drops into a small grad. cylinder and using the raw value to find a per ml equiv.) and it seems like the general range is 20-30 drops per ml, so I see why 20 drops is a reasonable estimate - for some reason e-liquid-recipes defaults to 35, and I don't think I have ever seen a dropper that is that precise - only pipettes.