Poking a thumbtack-size hole in the cup allows air to seep into the cup from the outside. The pressure of the air molecules both inside and outside the cup stays the same, gravity takes over, the card falls, and the water spills. Watch out for the carpet!

First off, when you just held the cup and let your finger off the hole, the water was pulled down by gravity and thus water pressure pushes it out the hole. So what changes when you drop the cup and water? The cup and water begin falling at the same speed, and are actually weightless as they fall.

FAQ’S. What happens if we drill two holes at different heights in a plastic bottle filled with water? That means, the hole at the lowest point experience high pressure and leak water at high pressure. Whereas the hole on the plastic bottle at highest point experience low pressure and leak water at low pressure.

Gravity is pulling the water (and cup) back to Earth, so the water takes the path of least resistance back to Earth – out of the holes. Gravity is also the reason water doesn’t leak out of the holes when you drop the cup in Step 4.

r/askscience. Can there be a hole so small in diameter that a water molecule cannot pass through it? The type of material you are talking about would be a molecular sieve. Water is one of the smallest molecules there is, being less than 3 angstroms across.

Hydrophilic materials make droplets to the outer edge of material and the diameter is measured from there. This means that a hole on a hydrophilic surface will leak through very small holes. Tested with an approximately 1 mm hole seems to be a close estimation.

It depends on the size of each molecule of water and a pin hole, if the pin hole is bigger than water molecule it will pass away and vice versa. If density of water is high it is quite difficult and if low density it will pass away.

Water likes to stick together, so it takes effort to separate a stream of water from a body of water. Unless you press the bottle—or unless the air in the atmosphere pushes on the top surface of the water—no streams will flow out from tiny holes. Air outside the bottle also presses against the water near the holes.

Frozen water, yes. Liquid water depends on your definition of hole. Apply too much power to a submerged propeller and it will dig itself a cavitation hole in which it spins more freely than in liquid. Get a cylinder of water rotating fast enough and a ‘hole’ will appear down the middle.

Blow hot air on the crack to soften the plastic and fill the crack with wire in circular motion. If the crack is bigger than mentioned above then it needs a patch of plastic made of same material of tank.

Secure the correctly sized hole saw in the chuck of a drill motor. Place the point of the hole saw pilot bit on the mark you made on the surface of the plastic tank. Pull the trigger of the drill to slowly drill a pilot hole in the tank wall. Stop drilling when the pilot hole penetrates the plastic.

Turn over your stock tank and use a quarter or half-inch metal drill bit to drill several drainage holes along the bottom. A good rule of thumb is to drill two holes per every square foot of bottom. Spray the holes with a galvanized compound to keep them from rusting.

Most plastics will melt and reharden when you apply heat. Use a soldering iron or a heated butter knife to carefully melt plastic around the hole. Use the soldering iron or knife or another tool, like a putty knife, to work the melted plastic into place to seal the hole. Smooth out the material as best you can.

Drill smooth holes through ceramic toilets. Drilling through a ceramic toilet means dealing with two issues: the hardness and the thickness. It’s essentially the same as drilling through ceramic tiles, but the thickness can vary on toilets.

Drilling a Ceramic Porcelain Sink You’ll need to use a carbide or diamond-tipped drill bit on your sink as it’s the hardest drill tip out there. Using the correct shape of drill bit can also make a difference in terms of both speed and precision. You can then start drilling in your designated spot.

You can drill porcelain but may require a diamond core bit to do it. There are some spade bits that MIGHT do it depending on the quality of the porcelain. A high quality porcelain is almost as hard as sapphire, which is next to diamond on the Mohs hardness scale. Some can fairly easily be drilled with a carbide bit.