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.
Rinse with apple cider vinegar. Among the many medical treatments apple cider vinegar can be used for, expediting the healing process of poison ivy exposure is one of them. Use a cotton pad to gently apply the vinegar to the area, or rinse it with a mixture of equal parts vinegar and water.ou can apply rubbing alcohol to your skin to dissolve the poison ivy or poison oak oils. Because the toxic oil from the plant seeps into your skin gradually, adding rubbing alcohol to the area will prevent the further spread.