Microwave Water Plant Experiment

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People get really worked up about this online. Some say microwaved water is totally dead and will kill your plants. Others insist it’s just water that got hot and then cold again.

So, who’s right? Well, the curious part is that something might actually be happening—but not in the way you’d expect. The water itself doesn’t “remember” being microwaved, but the structure of the water might change.

The “dead water” myth

You’ve probably heard the rumor: microwaved water loses its “life force.” Plants watered with it will wilt and die. It’s a spooky idea, but is it real? Nope, not really.

Water is just H2O at the molecular level. Heating it up and cooling it down doesn’t make it “dead.” It’s still the same stuff that clouds are made of. But here’s where it gets interesting: the gas content changes.

Oxygen, baby

When you microwave water, you boil it. Boiling drives out dissolved gases, like oxygen. Plants’ roots actually need that oxygen to breathe. Ever notice how a glass of hot water tastes flat? That’s because it’s lost its fizz.

So, if you water a plant with cooled boiled water (microwaved or not), you’re giving it less oxygen. That might make the plant grow slower, or even look a little sad. But it won’t kill it overnight. It’s like giving your pet fish deoxygenated water—not ideal.

Science experiment | Water purifier, Science fair, Plants