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Some very small insects can be seen moving with great ease on the surface of water How
air inside aluminium Anemometer atmosphere attract available in Hindi baking soda balloon Bangla bar magnet blotting paper blowing body bottom bowl bulb candle carbon dioxide cardboard cells cm long coin colours conduct this experiment convex lens cork device diagram disc distance earth electric current electromagnet evaporation eyes fill fingerprints flame flask friends funnel happens heat hold hole Hydrometer inside the bottle keep lens level of water lift force light rays lime water liquid litmus paper magnifying glass marble mark matchstick mirror molecules mouth moving nails needle nephoscope object observe pencil piece pointed end portion position pressure Rapidex remains roots rotating rubber saucer sheet side simple experiment sodium bicarbonate solution spoonfuls stalactites stalagmites stick straw string strip surface switch Take test tube thermometer torch tumbler vial wall weight white paper wind wind vane wire wooden plank