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This isn't a real volcano. It's a classic chemistry demonstration known as the ammonium dichromate volcano. When ammonium dichromate is ignited, it rapidly decomposes in an exothermic reaction, releasing heat, nitrogen gas, water vapor, and a cloud of green chromium(III) oxide. As the gases escape, they push the green ash outward, creating an eruption that closely resembles a miniature volcanic explosion. The dramatic effect made this experiment a favorite in chemistry classrooms for decades. However, it's rarely performed today because ammonium dichromate contains hexavalent chromium, a highly toxic and carcinogenic substance. Modern science demonstrations often use safer alternatives that produce a similar visual effect without the same health risks.
Did You Know23,105 次观看 • 19 天前
Ever wondered why they heat asphalt in tankers? At first, it seems unnecessary. After all, it's just a truck carrying asphalt. But asphalt only behaves like a liquid when it's extremely hot. During transport, it's usually kept between 150 and 180°C so it can still be pumped out once it arrives. The moment it starts cooling, it gets thicker and stickier really fast. Leave it long enough, and it can harden inside the tank. At that point, unloading becomes a nightmare, and the whole tanker may need to be heated again before anything can come out. That's why those tankers stay hot for the entire trip. They're not trying to make the asphalt hotter. They're simply stopping it from turning into a giant block of black rock before it reaches the road.
Did You Know24,790 次观看 • 29 天前
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