Real Engineerings | Engineering & Technology & Gadgets & DIY on Instagram: "A perfect demonstration of water displacement in construction. ​This clip illustrates a common challenge in civil engineering: backfilling in saturated, waterlogged ground. ​We see a precast concrete structure (likely a manhole section or caisson) set in a muddy excavation. As the excavator dumps a large volume of clean aggregate (gravel) into the pit, the gravel displaces an equal volume of water. ​With nowhere else to

Easy Physics Experiments For Kids - Little Bins for Little Hands