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A pickle jar can function as a tiny jet engine. The setup is simple: a glass jar with a small hole in the lid holds a volatile fuel like methanol, which evaporates to create a fuel and air mixture inside. A flame brought to the hole ignites it, and... the cycle begins. Here is what happens in each pulse. Combustion sends a sharp pressure spike through the jar, forcing hot gas out the lid hole as thrust. The escaping gas creates a brief partial vacuum inside, which pulls fresh air back in through the same hole. Residual heat ignites the new mixture automatically, and the cycle repeats dozens to hundreds of times per second. The jar and hole act as a resonant cavity, which is why it pulses instead of burning steadily. A single opening cannot handle exhaust and intake at the same time, so the system locks into a natural rhythm. It produces almost no real thrust, but it is a clear window into how actual pulsejet engines work, and the physics on display are the same ones used in real aerospace propulsion. Follow for more!show more

Mechanical Knowledge

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A spark plug is a small device in a car’s engine that creates a tiny electric spark to ignite the fuel and air mixture inside the cylinder. This spark is what makes the engine start and keep running. Without spark plugs, gasoline engines wouldn’t work

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Forget matches; this is how our ancestors used the laws of thermodynamics to start fires in seconds using nothing but wood and air. The secret lies in the sudden increase in pressure. By trapping air in a narrow tube and forcing a piston down, you are doing work on the gas. In a closed system like this, that work translates directly into thermal energy. Because the movement is so fast, it is considered "adiabatic," meaning no heat escapes. The resulting flash of heat is intense enough to create a glowing ember, which is then transferred to a larger "tinder bundle" and blown into a flame.

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Milton Friedman explains why price controls don’t work with a simple analogy 🔥 “Think of a kettle on your stove and it’s got a cover on it. The boiling water is threatening to throw the cover off. The obvious sensible thing to do is turn down the heat under the kettle. Another thing you can do is take a brick and put it on top of the kettle, and at the same time turn up the heat.” “That’s precisely what President Nixon did in 1971 when he simultaneously put a brick on top of the kettle by freezing prices and wages, and at the same time launched a more expansive monetary and fiscal policy which turned up the heat under the kettle.”

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