If there are sufficient gas producing bacteria present a dead prawn will float.
Dead bodies float on water much the same way living bodies do. And yes, living bodies do float on water. But if you panic and exhale, you will sink. IF you stay calm and keep your lungs inflated you will float. This is because of density. Anything less dense than water floats, and anything more dense than water sinks. Our human bodies have a density close to that of water and we WILL float if we keep our chest expanded and lungs filled with air. When people drown, their lungs are full of water and they sink. After a number of hours, up to a few days, gases from decomposition trapped inside their body make them buoyant and they will float. Then carrion eaters, blow flies, and other flesh eating creatures will puncture through their tissues, releasing the trapped gases, and causing them to sink again.
Usually a stuck float mechanism.
Yes, dead bodies can release gas and produce a postmortem fart due to the natural process of decomposition.
Bubbles float because they are filled with gas that is lighter than the surrounding air. This causes them to rise and float on the surface of liquids or in the air.
Bad float valve in carb
Bodies tend to begin to float when decomposition via bacteria produces methane gas, greatly increasing the buoyancy of the body. They initially sink due to relatively low buoyancy after the air has been expelled from the lungs. You can test the first part by going to a pool and exhaling all of the air in your lungs that you can. You will sink to the bottom of the pool rather quickly.
Helium has a low density and causes balloons and blimps to float
After death, the organisms/bacteria within the body will metabolise and multiply, producing lots of gas in the process. Most of this gas is unable to escape, so the body expand and float from all of the gasses present. The body will then sink again once it has decayed enough to allow the gasses to escape.
Gas floats on water because gas is less dense than water. The molecules in gas are farther apart and have lower mass per unit volume compared to water. This difference in density causes gas to float on top of water.
Helium balloons float because helium gas is lighter than the surrounding air. This causes the balloon to be buoyant and rise up in the atmosphere.
Helium gas is most commonly used to fill balloons to make them float. Helium is lighter than air, which causes the balloon to rise and float.