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.
* Once all the ingredients have been mixed well pour mixture into a spray bottle. * Spray poison ivy. Be careful not to get it on your other plants because this mixture will kill anything you spray it on! There you have it, the simple solution for how to kill poison ivy! If you want to have the greatest {deadly} effect it is best to spray the ivy during the dry seasons so it doesnât get washed off by the rain.