Fire Piston
By quickly slamming the piston down the air inside heats from the rapid, adiabatic expansion causing kindling in the volume to ignite. By doing this quickly we do not give the system time to dissipate heat to its surroundings.
By quickly slamming the piston down the air inside heats from the rapid, adiabatic expansion causing kindling in the volume to ignite. By doing this quickly we do not give the system time to dissipate heat to its surroundings.
An empty 2-liter soda bottle is partially filled with liquid Nitrogen (77K), and submerged in a 55-gallon drum of relatively hot water (300K). The liquid nitrogen evaporates into Nitrogen gas, which takes ~700x more volume. This builds enormous pressure until the plastic bottle bursts and releases all of the Nitrogen gas, creating a water explosion […]
Racquetballs are typically flexible and able to bounce, however, when frozen in liquid nitrogen, they become fragile and shatter when dropped, but regain their elasticity as they warm. Living cells, such as flowers, become brittle at the temperature of liquid nitrogen, and do not regain their original properties.
Intuitively we know that if we drop a feather and a coin from the same height, the coin will reach the ground first. However, this is due to the difference in air resistance between the feather and coin. When placing these items in a vacuum, removing the air, we see that the feather and coin […]
When rolling a hardboiled egg and an uncooked egg down a slope, the raw one will reach the bottom first. This is because the hardboiled egg requires a lot of rotational energy as the shell, egg white, and yolk need to be set in rotation. On the other hand, only the shell of the uncooked […]
One of the cookie cans has weights around the edge while the other has weights concentrated in the center. The one with weights around the edge have a high moment of inertia and therefor resistant to turning quickly resulting in the cookie can with the weights in the center to win.
By positioning forks together such that their center of mass is at just the right spot between them, they can balance on a toothpick with ease.
Placing the plastic hooked mat onto the stool pushes the air away from the top. Once the hook is pulled a vacuum is created and the negative pressure allows the stool to rise with the mat.
By discharging the capacitors through a large coil of wire extremely quickly, an extremely large magnetic field strength is induced at the center of the coil due to electromagnetic induction. When you place an aluminum soda can inside the coil , the can is crushed inwards almost instantaneously by the strong magnetic forces it experiences.
The atom smasher demonstrates what happens in a particle accelerator. A particle is accelerated, then colliding with a target atom. This collision results in new particles, which may have been previously discovered, or otherwise may be a brand new isotope.
Penrose tiling demonstrates aperiodic tiling, a type of tiling that will never repeat if shifted a given distance. This type of pattern shows up in quasicrystals, a type of crystal that is structurally ordered but not periodic.
In equilibrium a peep (marshmallow) has the same pressure inside and outside of its surface. However, if you reduce the pressure outside then the pressure from inside will cause the object to expand. This is particularly evident with peeps because they are full of air bubbles that will expand dramatically under vacuum.
Because of the way that the balancing bird is spreading its wings, it is able to distribute its weight in such a way that it creates a center of gravity right below the beak. Having the center of gravity below the beak allows the bird to be balanced on a finger.
A person can be able to sit on a bed of nails without being injured. This is because the pressure that the nails create is inversely proportional to the area in which a force is spread along.
Through the conservation of energy, once the croquet ball is released at a certain height the potential energy is converted to a combination of kinetic and potential energy. As long as no additional velocity was added to the system in the beginning, the ball should return at the same point at the end of it’s […]
Objects with a higher moment of inertia resist the change in angular velocity. A comparison can be felt when rotating a rod with weight in the center on weights around the edges. Weights around the edges result in a high moment of inertia and therefore harder to turn.
When the bottle is squeezed, the air that is in the diver is allowed to compress. This compression of air in the diver makes it more dense than the water around it, so it sinks. When the bottle is released the diver becomes less dense and allows it to rise.
Each metal expands at a different rate. When two metal sheets are fused together and heated up, because one of the metals expands at a faster rate, the two strips will begin to curl to make up for the difference in expansion.
Initially the ball is just shy of being able to fit into the ring. But if the ring is heated up, it will expand slightly so that the ball can finally fit.
At the base of the two swords, there is a gap that once the electric potential is high enough, the air in the gap begins to ionize. Just as hot air rises, the hot ionized air in between the two swords will begin to rise until the distance between the probes is too great and […]
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