While vacuums can do pretty wild things to liquids, the title of this Slow Mo Guys video is a bit misleading. They’re not so much exploding gold in a vacuum as they are shredding it during repressurization. Regardless, the visuals are pretty awesome. They place thin foils in a vacuum chamber, pump it down, and then film what happens when they reopen the valve and pressurize the chamber. Flow-wise, that introduces a strong air jet that flows downward in the center of the chamber and causes a recirculating flow up the sides. For the foils, this sudden flow is devastating, shredding the material so thoroughly that it looks like a splash. (Video and image credit: The Slow Mo Guys)
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