How does putting hot water on tight caps make them easier to open?
104094
cold make stuff get bigger but hot water makes stuff constrict
247767
Water can be compressed, when you compress something it cools, so when you compress water fast enough or with enough pressure it will just freeze.
1024386
Pressure relief valves are valves designed to open at a certain pressure, usually to protect equipment from rupturing due to high pressure.\n\nMost industrial pressure relief valves are spring loaded devices that will pop open at the pre-set pressure, and then re-seat after the pressure has fallen low enough.\n\nIf you have a hot water tank in your home, it probably has a pressure relief valve, designed to blow off some water if the pressure gets high in the tank, to prevent the tank from exploding dangerously.
82527
This is not chemistry, but physics. I presume you are boiling water in a can, then sealing it and cooling it. There is then less pressure inside the can, since the water takes up less space than the water vapor. There is now more pressure outside the can than inside the can. You have unbalanced forces, and the can is unable to resist the pressure.\n\nThis can of course get far more complicated, and we can discuss the ductility of the can, and continuum mechanics of the can, and its chemistry, but I do not think you want anything that advanced. If you do, let me know.
1037898
It's a lot easier to just buy a new tube. \n\nAssuming you have a good reason I would:\n - put the lid on, \n - push all the paste to the top. \n - cut off the flat bottom of the tube \n - put your toothpaste back in\n - roll the bottom a couple of turns and secure.
1084115
Its a trick! you have one already tied  keep it under the top lip, then put the stem in there, while your bringing the already tied one down, and hiding or swallowing the stem, this look's like your tying it!
708573
Items needed -\n\nPlastic Bottle\nDry Ice\n\nHow to do it..\n\nPut some dry ice in the bottom of a empty water bottle - little chunks of it should be fine. Put about an inch or two of it in the bottom, you dont need much at all\n\nNow here is the dangerous part..\n\nPut some cool or warm water in the bottle, just pour it in almost to the top, leave about an inch or two, now put the cap QUICK and throw it or put it on the ground, it could go off quick, or take a few minutes.\n\nIf will expand and expand until it goes off, so if you think nothign is happending, you are WRONG. Give it at least 5 minutes. If it has not gone off, throw rocks or somethin at it and then it should go off.
801436
Use specific heat capacities and latent heats of these materials along with your head to get water at 0C
774983
Typically so that you minimize the amount of time struggling to open the capped tube once you have the sterile pipette exposed to the air and you are waving it about.
112251
Cold liquids dissolve gases better than warm ones. When you heat the bottle the temp. of the drink drops and the dissolved gases escape. But stay inside the bottle. Further heating cuaseas them to expand resulting in greater kinetic energy of molecules resulting in the bursting of the botle.
1098146
If the air inside the bottle was heated first, by boiling water or even a piece of burning paer dropped inside, the air inside the bottle expands because of the heat.  As it cools, the air takes up less space and whatever object is covering the opening of the bottle is sucked in by a vacuum effect.
837980
get a big bottle. (i.e. a coke bottle. just make sure it's big.) ok, put about 1/2 a cup of water in it, and get some matches. Hold the match and put it in the bottle for about 5 seconds. Put it out immediatly if it touches your fingers. Then, put the cap back on the bottle quickly and squeeze the bottle. For best effect, but it against some light.
886976
Just break the "head" gently w/ a needle to allow easier popping.
550130
warm saltwater helps to dry up an infection so it is easier to get rid of
236269
Because the atoms in heated water are farther apart.  It actually makes the water less dense.  It then becomes easier to freeze less dense liquid.
683167
It's really easy once you get the hang of it. First, make sure that the plastic wrap is put in properly(if you don't have the instructions that came w/the Diaper Genie, they should be on the back of every refill) Then you just fold up the diaper and put it into the Diaper Genie until it is secured between the 2 plastic holders  located about half way down. You should then be able to let go of the diaper without it moving. Then, just grab the top of the plastic wrap and twist it about 3 times and then shut the lid! It's really a lot easier than it sounds. You'll get the hang of it. It took my husband a few times to get it just right :0)
312832
Your question comes up about 3 times a week. There needs to be a way to easily search previous answers quickly...\nlaptops are different from regular keyboard problems...\n People have suggested Q-tips, damp cloths, spray air cans,\npopping the key caps off, and cleaning around ( some caps do not come off !). I have seen dozens of different kinds of laptop keyboard constructions, so it is a bit difficult to \ngive "one" answer. \n I would approach the problem slowly and carefully! Iff the key caps snap off, like most desktop keys, you can easily clean under them. If they don't you may have to take out\nthe keyboard - many laptops have a hidden release button or two along the top or bottom edge, or you slide the entire board up or down to release. If you go to the manufacturers website, they may have technical details on how to snap out the keyboard, which, then, you clean more easily.\n I have seen keyboards which are built into the top half of cover, so you have to completely take the laptop apart to access th keyboard... not advised.\n The easiest method is the slowest - Q-tips in alcohol or\ndamp with mild soapy solution of water- iff you can even get under the keys.\n I would remove the power and the battery before cleaning..\nGood luck... and avoid any stupid solutions involving boiling Sulphuric acid, or whatever...