In science today, we showed the class how our submarine works. Sophie and my submarine only floated and sank. It didn't stay in neutral buoyancy for three seconds. Our submarine only stayed in neutral buoyancy for 1 1/2 seconds. In my opinion, our submarine didn't stay in neutral buoyancy because it was my fault. It's because my breath control was not precise enough. Also this probably happened because there was too much weight at the bottom of the bottle, so the bottle went cap-side up.
Sophie and I built our submarine in a specific way. I put a few weights on the bottle for more mass, two holes poked in the bottle for the water to go in, and our tube poked through the bottle to blow on. The holes was so the water could fill the bottle up and the bottle would sink. Also, I could blow into the tube to remove the water so the bottle could float.
Sophie and I were inspired to design our bottle this way because of a real submarine. The ballast tanks of a real submarine are like our bottle. If the ballast tanks are full, the submarine sinks. If the ballast tanks are half full, the submarine stays in neutral buoyancy. If the ballast tanks have no water in it, the submarine floats. That's how I built my submarine!
Sophie and I built our submarine in a specific way. I put a few weights on the bottle for more mass, two holes poked in the bottle for the water to go in, and our tube poked through the bottle to blow on. The holes was so the water could fill the bottle up and the bottle would sink. Also, I could blow into the tube to remove the water so the bottle could float.
Sophie and I were inspired to design our bottle this way because of a real submarine. The ballast tanks of a real submarine are like our bottle. If the ballast tanks are full, the submarine sinks. If the ballast tanks are half full, the submarine stays in neutral buoyancy. If the ballast tanks have no water in it, the submarine floats. That's how I built my submarine!
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