Most substances get smaller when they solidify and become more dense, but water actually expands. Where things get weird is in the expansion/contraction in the transition from ice to water or from water to ice. These numbers shift a bit based on what’s dissolved in the water (salt, etc.) and pressure, but the vast majority of the time that won’t really matter since measuring specific temperature doesn’t come up much in a game with dragons that breathe fire. Water freezes at roughly 32 degrees Farenheight, and boils at roughly 212 degrees Farenheight. The basic physics of water are fairly simple. It also rules out plants, animals, and other creatures since a layperson wouldn’t identify a jellyfish as water despite being composed of 95% water. That test rules out steam, ice, vapor, simple syrup (water super-saturated with sugar), poisons, alcohols, bodily fluids of most types, oil, and many “solutions” which players might try to argue are water due to their component parts. The substance is not so full of other substances that a layperson would identify it as a different substance, such as blood, syrup, or wine.The substance’s viscosity is consistent with water (it’s not sludge, gel, etc.).The substance is a liquid composed primarily of water.Here is what I propose to judge if a substance is water: Purity is clearly part of it, but it’s unclear how much. At what point does it stop being muddy water and become mud? Jellyfish or 95% water, but they’re not “water”.ĭefining a test for what constitutes water is hard. Now imagine that your mystery liquid is instead dirt, and you’re mixing it into water. As you pour your mystery liquid into your water, at some point it’ll stop being “water” and you’ll think of it more as a mixture or as a diluted quantity of that mystery liquid. The first few drops we can still say that I have a cup of water. I then stir in some quantity of another liquid substance that contains no water. But having a clear answer that you and your DM both agree upon is foundational to how Shape Water works.įor example: I have a cup of pure water. ![]() The question “what is water?” seems so silly on its face that the fact that I’m raising the question seems like a waste of time. We’ll look at the game rules of course, but we’ll also need to spend some time consider physics, chemistry, and some fluid dynamics to understand how water works in the real world in order to apply that knowledge in your game. This article may take you to some unexpected places. Of the three cantrips, Shape Water is without question the most versatile and powerful, but understanding why that’s the case requires some examination. ![]() Introduced in the Elemental Evil Player’s Companion, Shape Water was one of the four new elemental cantrips intended to offer spellcasters some magical control over the elements.
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