How can we make an object that is submerged in water, more dense?
823437
If you take a balloon under water, and go further and further, the air becomes more dense...due to PRESSURE.   The way a submarine dives is completely different then denser/less dense ....it's that they are mostly filled with air...so they should float...but they have enough weight that they sink too,  it's almost a balance, but they have tanks that they let fill with water to sink, or push air in (and water out) to get lighter and float.
289385
Denser materials can "float" in the sense of remaining suspended, if they are small enough; think of candle soot. The particles must be small enough so that their fall rate is dominated by their air resistance rather than their weight. Such floating is also helped by brownian motion.
677263
Density is mass/volume.  Find its mass by weighing it. Find its volume by immersing it in water and measuring how much water it displaces.  That is its volume.\nDivide mass by volume and you've got density.\nP.
462517
If there are bubbles of air then you will have less liquid than you are intending to have. Assuming you are calculating density via measurementof mass then the mass you get will be less than it should be for that volume of that liquid. As a result the calculated density will work out lower than it should do.
886442
most solids are more dense than the same substance in liquid phase and will sink.  Water/ice is an exception to this rule.
190514
Density of matter is the reason anything floats.  Any object that displaces its own weight will float. Salt water raises the density of water. Consequently any object will float easier in salt water because it only has to displace little weight compared to non salt water
702932
try some physics ! fill a glass with water til its rim , put apiece of paper flat on top of water touching the rim and turn it upside down water shouldn't spell , if in doubt do it over the sink.\nyou may put enemy inside !
902905
Ok. this is simple. u need to know about buyoancy, like how air is lighter than water. all you really got do is put some small weights (ex. paper clips, rocks, etc) in the bottle. have it so that it will just barely float. then cut a hole to the side and insert the end of a tube in it. make sure it is water tight. then place it in a tub. it shold float, when you suck on the end of the tube, it should take some of the air out making it less buoyant, and therefore it will sink. there are also many other ways to do this that will make it function more like a real submarine like putting the bottle with weights inside and somehow add pressure to the the outside of the tube to compact the air inside the bottle, causing it to sink. good luck on your project
695394
Add a drop of food coloring in water. It starts concentrated and defuses through the water.
1148382
To do it accurately you may need a PhD. \nOtherwise, build a trough with an uneven bottom.  Then build a ramp to the trough.  On the top of the ramp have a bucket that is constantly being filled with water from a fish tank pump.  Make the bucket so that when it is filled to a certain level it tips and pours down the ramp into the trough.
879947
Hello,\nDensity is mass per unit volume.  The density of fresh water is one gram of mass per cubic centimeter.  Since, the ocean water has salt in it, there is more mass per cubic centimeter of salt water.  If you think about a glass full of fresh water and a glass full of salt water, you can easily see that the glass full of salt water has a lot more material(mass) per cubic centimeter than the fresh water does.  So the glass full of salt water (or the ocean)is more dense than the glass full of fresh water.\nAnd that affects a boat by making it float higher.  When an object is placed in water, it displaces as much mass of water as is contained in the object.  Again you can think of a glass of water.  If the glass is filled to the top and you place an object of mass M-grams in the glass, then the amount of water that spills out is M-grams.  The object displaces the mass of the water by sinking into the glass.  Once it has displaced M-grams of mass, it can't displace any more, therefore it will stop sinking as soon as it displaces M-grams.  So since each cubic centimeter of salt water is made up of more mass than fresh water, the object will displace less cubic centimeters of salt water than of fresh water, so it will float higher.
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.
251207
Don't have it handy,but it'sjust a little denser than water, from what I remember. Check www.nasa.gov. They have lots of planetary info!
149451
Objects float because the density of the object is less than the density of the liquid. If you increase the density of water by dissolving something, such as sugar or salt, in it and create a situation where the density of the water exceeds the density of the egg, the egg will float.
213217
It's the density of the rubber that matters, not the mass of rubber, and there are rubber formulations that are less dense than water.  The easy answer is do the experiment and see.\n\nYou might always want to try it with different temperatures of water inside and outside of the balloon.
584782
Make it a small float and use tissue paper.
810641
Use Archimedes's buoyancy principal.  The weight outside represents the response of mass to the Earth's gravity.  The weight in water represents the displaced water's weight.  Use the ratio to get the answer.  HINT: if you convert to mass, the answer almost gives itself away.\nThe displaced water has a well known density.  That density will give the volume of the both the displaced water and the object displacing it.