Originally, exactly as much as a volume of water equal to the cube of the hundredth part of the metre, at the temperature of melting ice. I don't find that terribly helpful. Not many did. That's why, in 1889, the mass of the kilogram was redefined as being equal to the IPK.
Boiling water is also an effective poison ivy killer. If the area where you will be killing poison ivy has no other plants you wish to keep, pour boiling water over the poison ivy plant. Boiling water will kill any part of a plant that it comes in contact with, so be careful using this around desirable plants.
Does rubbing alcohol really dry up poison Ivy rash? Does rubbing alcohol really dry up poison Ivy rash? Or what else might you recommend to dry up poison Ivy quickly. Some people say use hot water until you cant bear it anymore and others say bleach or alcohol? Anyone had any experience with these?