Journey into the World of Physics on Instagram: "🚫 THIS IS WHY MERCURY IS NOT ALLOWED IN AIRPLANES ✈️ Liquid, shiny, and fascinating—mercury looks harmless at first glance. But inside an airplane, this tiny metal can quietly turn into a serious threat. Aviation safety isn’t just about engines and wings… sometimes, it’s about chemistry. When mercury touches aluminum (the primary material used in aircraft structures), it causes liquid metal embrittlement. This reaction slowly eats away the alumin