How Does This Candle Suck Water Up Into a Glass?

It’s a classic demo and one that you can try yourself. You light a candle and put it in some water (I used blue dye in my water). Next, cover the candle with a glass. As the flame burns out, the water gets “sucked” up into the glass. It’s pretty cool. Let me start off with the “sucked” part. No, the water isn’t actually sucked up. Actually, the pressure inside the glass is reduced while the pressure outside the glass (due to the atmosphere) stays constant. Since the outside pressure is greater than the inside pressure, the water gets pushed up into the glass. <a href="https://rjallain.medium.com/how-does-this-candle-suck-water-up-into-a-glass-f8cb3bef33b9">Website</a>