What will sink and then float again?
139842
Place a lump of dry ice inside a chamber with some holes in the bottom that will fill with water, but has a sealed top. The water will flood into the chamber, and dry ice sinks in water. Properly weighted, the chamber will also sink to the bottom. However, as the dry ice warms up, it will sublimate to produce carbon dioxide. Some of the carbon dioxide gas will fill the top of the chamber with gas, which floats. Eventually, if the weights are balanced appropriately, the chamber will float back to the top.
825037
For the cork to sink it must raise the water level. Since it must raise the water against the force of the centrifuge - pushing harder on both just doesn't do the job (of sinking the cork).
785776
I did this a long time ago at a science fair.  You need a small glass tube, like a test tube, but not too big.  Put a weight around the opening so it will float with the open end down.  The tricky part is to adjust the weight in the tube to it just floats.  Another way is to adjust how much water is in the tube when it is floating.  Put it in a plastic bottle with enough water to allow for submerging and surfacing.  (They don't like the work "sink" on submarines.)  To make the tube submerge, squeeze the bottle.  This compresses the air inside the tube.  The air takes up less space, provides less floatation and it submerges.  Release the bottle and the tube rises again.  It was acutally a lot of fun when I did it.
19622
Depending on the volume of compressible air within, the weight and density of the ball material, the density of the water and the pressure on the ball, it will first keep wanting to go up until it is compressed so far that there is an equilibrium, i.e. nothing happens. When the pressure increases further, the ball might become heavier than the water and sink down - depending on the density of the material and its compressibility.
480070
Good question, oil and gasoline will both be floating above the water, but which one is going to be floating on top the other is a hard one, i'm still searching....\n\n\nI can't find nothing on oil and gasoline, my guess would be that gasoline will float on top of everything.\n\nSo, water then oil then gasoline. It might depend on type of oil too. The best way to find out is to get a clear jar, get some oil and gasoline, see which one floats!\n\nAnd here's some concepts of buoyancy nad density, also gravity...\n\nAny object placed in water has to contend with two forces, gravity and buoyancy. Gravity is the natural pull of an object toward the center of the earth. Gravity tends to pull a boat down into the water. So what keeps it from sinking? Buoyancy acts as an opposite force to gravity and pushes the object up. Archimedes' Principle says that an object immersed in water is buoyed up by a force equal to the density of the water it displaces. The buoyancy of an object is dependent on its density and the density of the material surrounding it. Density is the relationship between mass and volume.
460243
i assume you mean why dont the rotten eggs "drown" as in sink. well this is because when they go rotten as the egg starts to decay it broduces gas, mostly methane and sulphor so this means thats the egg becomes lighter so making it float.
339754
go float into one and when or if you come back tell me.
984345
The front,then it falls in the water.
916803
it would float around aimlessly
885671
DENSITY is the key.\n\nRemember, an aircraft carrier will float in water because it is less dense than the water.  To calculate density, divide mass - kilograms (m) by volume - cubic meters (v).\n\nPure water at 25 degrees Centigrade has a density of 998 kg/m^3 so any object with a density lower than this would float.  Higher would sink.\n\nInteresting note:  If you could find a body of water large enough, the planet Saturn would actually float in it since it is less dense.
417764
It's a question of the relative amounts of muscle and fat, together with the density of your bones. Basically, if your overall body density (mass/volume) is >1 you will sink, if it's <1 you will float.\n\nThe air in your lungs *does* make a difference, since taking a deep breath both expands your volume, and increases the amount of low-density stuff in that volume. If I have a lungful of air, I can just about float; breathe out, and I sink.
648558
when scuba diving the object is to put enough air into your bouancy compensator(bc) to remain neutrally bouant at a point. so you wont sink or float anymore. its basically balancing out the pressure above you with the pressure below you by surrounding yourself with air. so if taken to a certain depth maybe a decomposing body would release enuff air to remain neutrally bouant at a certain depth.
926031
Wood!\n\nAnd anything else that floats: ducks, apples, good gravy, very small rocks...
202226
a great place to start would be in your toliet.....chit floats so you wouldnt ever have to worry about drowning!
987768
Not every solid sinks.... it depnds on the density of the solids.
291004
if an object is floating, the buoyant force on it equals its weight -- the vertical forces have to sum to zero.  try drawing a free body diagram to convince yourself of this.
630018
When you softly place a pin onto the surface of water (horizontally) it doesn't sink because the weight of the pin is balanced by the upward (vertical) component of surface tension. When you add a detergent powder it reduces the viscosity of water and hence the upward force due to vertical component of surface tenbsion decreases and hence it sinks.