If you are looking for the answer of “Why Water droplets confuse your smartphone touchscreen and how Do Trick Birthday Candles Work?”. Then you are in the right place.
Why Water droplets confuse your smartphone touchscreen? – Touchscreen locates your finger on the grid by measuring how much the charge drops between two intersecting electrodes, a process called “mutual capacitance.”The problem is that drops of sweat or rain can reduce the charge too by providing another conduit between the electrodes. Thankfully, over the past few years, touchscreen engineers have solved the water problem by drawing on a different mode of touch sensing called “self-capacitance.”
Instead of measuring the charge across pairs of electrodes, the touchscreen measures the increase in charge between an individual electrode on the screen and the ground you’re standing on. Because water droplets aren’t grounded, the phone’s firmware is better able to ignore them. But it is also not fully successful because it won’t work during multipoint touch operations like pinch, zoom etc.
How Do Trick Birthday Candles Work? – Have you ever seen a trick candle? You blow it out and it ‘magically’ re-lights itself in a few seconds, usually accompanied by a few sparks. The difference between a normal candle and a trick candle is what happens just after you blow it out. When you blow out a normal candle, you will see a thin ribbon of smoke rise up from the wick. This is vaporized paraffin (candle wax). The wick ember you get when you blow out the candle is hot enough to vaporize the paraffin of the candle, but it isn’t hot enough to re-ignite it.
Trick candles have a material added to the wick that is capable of being ignited by the relatively low temperature of the hot wick ember. When a trick candle is blown out, the wick ember ignites this material, which burns hot enough to ignite the paraffin vapor of the candle. The flame you see in a candle is burning paraffin vapor. What substance is added to the wick of a magic candle? It’s usually fine flakes of the metal magnesium. It doesn’t take too much heat to make magnesium ignite (800 °F or 430 °C), but the magnesium itself burns.
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