How can you modify a dense solid substance to make it float in a less dense fluid?
918509
dip it in water and freeze it? put it in a flotation device.
823430
the buoyancy of the object and its volume.
89807
1. you need firstly to have a total density equivalent to that of fresh or salt water(for whatever purposed required)\nthen bouyancy will be stable/maintained \nthis will make a suitable start\n2. forge a shape suitable to make the sub hydrodynamic, this will enable the prototype to glige through the water \n3. have fun!
94309
because it is less dense than the water
971882
Easy!\nStir the mixture into water. Sand sinks. Styrofoam floats.\nScoop the Styrofoam off the water surface with a strainer.\nPour off the water.
107612
This is potentially a massive and complex task.\nSearch the web for "computational fluid dynamics".  Here's what I found in a couple of minutes:\nThe 1st ref. below has some interesting simulation ideas (but unfortunately for a liquid, not air).\nThe next discusses things you should know before even deciding whether to do this.\nThe last gives links to software downloads.
868889
No. You need high density material and mass to create a strong gravitational pull.
883842
the pressure will be higher but the density won't change, it can't possibly change if it's a sealed, rigid container, density is mass/volume and you aren't changing the mass or the volume, therefore the density will be unchanged
835572
Gotta approach this using basic principles.\n\nEnergy is the integral of force applied over a distance.\nTheres two sets of forces working:\nfluid and gravitational.\n\nSo you make your control volume, and look at it.\nYou want to raise the water in it, thats mgh or rho*v*g*h\n\nYou also have to exert a pressure to push against the water ahead of it.  The downward pressure acting on your control volume is f/a so the force you must overcome is p*a and you are traversing distance h so the energy is p*a*h\n\nTherefore to raise the fluid vertically against a down pressure and against gravity the minimum energy (real world is lossy) is \nE = h*(mg+pa)
294040
Things float as long as the water they displace (move out of the way) weighs as much as they do. Whether that happens depends on the density of the thing. The density of an object is equal to its weight divided by its volume. Every substance, including water, has its own density at a given temperature (density can vary as a substance gets hotter or colder). Any substance that is less dense than water floats while one that is more dense sinks. However, even though cargo ships hold a ton of heavy cargo, they have chambers of air inside that make them mostly hollow. This brings me to the main point... an object that is hollow like a cargo ship floats if its density-its weight divided by its total volume is less than the density of water.
959807
You must show not tell. Take a bowl filled to the top with water and put it on a plate to catch overflow. The put objects in the water and compare the overflow for sinking and floating objects of the same size. If you have a scale weigh the objects and the water if not just hold them and judge weight. Then explain density.
874425
u should try coins and other metals, also try sponges and cloth and things that u are sure wont float.  u mite be suprised with what u discover.
784253
Does density affect  items when temperature, humidity, and  gravity are changed?
243171
Take a balloon and blow it up partially.  Weight the balloon and submerge in a beaker of water (so it doesn't float).  Gently warm the water with a burner or hot plate.  The balloon will get bigger as the water gets warm.  Then you can remove and submerge into ice water to see it shrink.\n\nThe volume of a gas is directly proportional to the temperature of the surroundings.\n\nAnother idea: Fill the bottom of a pop can with water.  Heat the can using a hot plate.  Allow time for most (but not all) of the water to boil away into steam.  Using tongs, pick up the can and place in ice water.  The can will collapse!  For a louder effect, use an old metal gas can.
330764
Either drop the temperature (remove the enthalpic - heat - energy) or increase the pressure (the less space it has to move freely the closer to solid it becomes) or both
408700
The following link is a pdf slide show that gives examples of buoyancy calculations and theory of floating objects.\n\nhttp://www.colorado.edu/physics/phys1010/phys1010_fa05/lectures/class12-09-29.pdf
943048
Whenever the mass of an object is less than the mass of the liquid it displaces, it will float.  That's why a hunk of steel won't float, but a ship made of steel, enclosing lots of unoccupied space, will float.\n\nAs for the ice cream, its made up of lots of fat molecules whipped into a semi-solid.  Its mass is less than the mass of the root beer it displaces...therefore it floats