is there a dent in a water puddle before the droplet hits the surface?
444669
There is a dent, although it is quite small and also short-lived. The air pressure just in front of the falling drop pushes the surface down just before the drop hits.\n\nBuh-bye now.
140056
((((((Edited)))))\n\nThe short answer is friction. If the drops were in a vacuum they would fall that the same rate no matter the size. The drag of the friction in the air slows down the falling drop.\nIts called fluid friction and is affected by viscosity of the air and the weight of the droplet overcoming the drag.\n\nhttp://www.answers.com/Fluid+Friction?gwp=12&method=2\n\nI dont know how helpful that was but do some searches on fluid friction and you may find what you are looking for\n\nGood Luck!
368357
The test liquid will sink to the bottom because it is more dense than water. Water has a density of 1.0 g/ml. There fore it can be simply thought of as "lighter."\n\nThere will be two visible separate layers.
443544
To start with, the air and water would leak out of the station. The vacuum would not leak in.\n\nOnce the water droplets had passed through the hole, they would boil almost instantly into a gaseous form.  This conversion from liquid to water vapor would absorb a lot of heat (latent heat of vaporization) thus causing the temperature around the reaction to drop. This would have the potential to freeze some of the water before it has a chance to vaporize.
86129
Several, actually. First, surface tension of the soap holds it together. With equal pressure inside, all surface points are equally stressed outward. And the sphere is the smallest surface area available to a certain volume. Same applies to raindrops.
65490
yes, just a few drops could do some damage
654217
How droplets form:\n\nRain droplets are formed from water vapor in the atmosphere that condenses onto dust particles.  Water vapor is lighter than air, but water is not.  The condensation onto the impurities in dust (nucleation) is more kinetically favorable than a sudden, rapid condensation of all the water in the air (making a splash).  This nucleation phenomena is very similar to observations you can make when you boil water (or let carbonated beverages bubble).  The bubbles will form (nucleate and grow) at tiny cracks and imperfections.  (A very smooth container will have fewer bubbles). Eventually the bubbles get big enough (buoyancy overcomes surface tension) and they rise to the surface.  The main differences between this and rain is that these gas "droplets" fall upward because of buoyancy and they have to overcome an adhesive force to start falling, whereas rain just has to fall fast enough to escape air currents.\n\nThere is another less kinetically favorable mechanism for boiling water that you can sometimes repeat in a microwave, but it is very dangerous.  If you heat water in a microwave, it is possible to get it higher than the boiling point because there hasn't been sufficient time for steam bubbles to form and grow and rise to the surface.  As soon as you touch the surface of the superheated water with say a spoon you could be providing a nucleation site and the water will suddenly boil very dangerously.  If you do this experiment, be very careful.\n\nIf rain WERE observed to fall as a sudden splash rather than as droplets, an analagous condition would be that all of the carbonation in your soda will come out in a sudden blast of carbon dioxide, making a mess and giving you flat pop instantly.  Both processes involve nucleation and growth of droplets (bubbles).\n\nHow droplets fall to the earth:\n\nAll objects heavier than the air will fall to the earth, accelerating until they reach their terminal velocity (the fastest they can go relative to the air speed because of drag).  Really small objects, like rain droplets or insects have very small terminal velocities, so they can get buffeted around without falling much.  Once a rain droplet gets big enough, it can finally fall to the ground at a reasonable speed.  It has a limit on how large it can get because the bigger it gets the faster it falls.  Some basics behind the math follow.\n\nThe terminal velocity is reached when the aerodynamic drag force exactly balances the gravitational force.  The aerodynamic drag force increases with surface area and with velocity (lets consider it to be proportional to the velocity in this example...this is true for sufficiently small objects).  The gravitational force increases with mass (or at constant density) volume.  Volume is roughly proportional to the cube of the relavant length scale of the object.  Surface area is roughly proportional to the square of the length scale of the object.\n\nThus the ratio of the drag force to the gravitional force is c*v*L^2/L^3 = c*v/L, v is the falling velocity, L is typical length scale of the object (like a meter for a person, a foot for a bowling ball, a cm for a big bug), and c is a parameter that lumps together the effects of shape, viscosity, density, and so on.\n\nSo when this ratio c*v/L = 1, the velocity must be the terminal velocity, the fastest the object can fall, v_t.  If you rearrange the equation you see that c*v_t = L.  This means that for a given object with the same physical properties and shape but differing size, the bigger object will fall faster.
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.
168918
I would say probably not, but check with your doctor. The spill might have other adverse effects on your health.
43901
How high up is the cloud? What is the level of the ground?\n\nIt'll take less time for a raindrop to hit the top of a mountain than to hit the ocean.
490087
Flow in a straight pipe will have a certain pressure drop depending upon the pipe material and flow etc. When the flow in a pipe goes through a bend there will be a drop in the static pressure. Dented pipe is likewise a flow disturbance and will result in some static pressure drop.
494151
It's bernoulli's principle. Fluids have a lower pressure when moving than when still. Since the water is moving past the spoons (which act like the wing of a plane) they feel a pull from the pressure drop and come together. Try it with a peice of paper sometime. Roll a piec of paper up so when you place it on a flat surface it looks like a curved bridge. then blow under it and it will collapse instead of blow away. It's pretty neet.
152879
No, it will not.  The other answers to this question are on the right track, in that they point out that an object's density is the key thing in most situations, since if it is less dense than the fluid it is in, it will displace fluid equal to its weight before it is completely submerged, and hence float.\n\nBut in *this* problem, we are told from the outset that there is not enough water to be displaced.  Therefore, the object will displace all the water, all 1 lb. of it, and still not have displaced enough water to equal its weight.  Therefore, it will rest on the bottom, i.e. not float.
327534
I don't believe so. That's why it's called 'terminal'. The surface of water when hit at high speeds isn't any 'softer' than actual ground. It just looks more pretty.
380715
Rain.  you are describing the dewpoint.
315092
Water and impurities in the water cause friction.
741734
to ensure that there is no added volume that may be caused by the water residue in a wet cylinder.