Science Is Fun By Tomas Rosko on Instagram: "Hot Piranha is a mix of concentrated sulfuric acid (H₂SO₄) and hydrogen peroxide (H₂O₂). Why is it called hot you ask? When you mix peroxide into strong sulfuric acid, the reaction is very exothermic (releases a ton of heat). The solution can heat up above 100 °C. Because of this heat + reactivity, the solution often bubbles and looks “alive” in a way — that’s why labs call it “hot piranha”. It’s used mostly in microfabrication / semiconductor labs to