© Wikimedia CommonsIce block at beach near Jökulsárlón, Iceland.
Besides vapor, ice and liquid, a fourth form of water may exist, but don't worry, Kurt Vonnegut fans, it's not ice-nine, the dangerous, solid at room temperature substance from the book
Cat's Cradle. Unlike the fictional ice-nine, which melted at 114 degrees Fahrenheit, this new form of H2O likes it cold, about 54 degrees below zero Fahrenheit.
Liquid water usually freezes into ice at 32 Fahrenheit, but under the right conditions, like the high pressure at the bottom of the ocean, water stays liquid below 32 Fahrenheit.
Water's fourth form, or phase, may be a liquid with some of the properties of both ice and regular liquid water. But laboratory equipment isn't sensitive enough to observe the rapid transformation from regular liquid water to the fourth form.