Recent content by gijsbert2002

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    Wilson cloud chamber

    I don't understand what you mean with this post. Do you mean that hurricanes can hold water really long? That is a very different mechanism, they actually suck up water, just like cars and trees and stuff. I'm more interested in how long still air can hold enough water to see cosmic rays, in a...
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    Wilson cloud chamber

    Hello everyone, in the 1910's Wilson build the very first cloud chamber based on watervapour and adiabatic decompression. With this device you can see radiation from radioactive materials and cosmic rays. For a description see...
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    Playing with oil, water, and glass

    That is really interesting. maybe it's like this: The oil is hydrofobic. I'm not so sure about glass, but if it is also, than the glass and the oil shoud stick together in a watery environment, because the water wants to stick together with itself. I think it must be something like...
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    Playing with oil, water, and glass

    The answer is not so difficult. the oil goes up, because the water above it is heavier and pushes down with more force, moving below the drop of oil and pushing the oil up. Now the oil is stuck at the side. It is spread out along the glass. the oil drop has a very big surface now, but almost...
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    Liquid N2 experiments

    We allready do the cork trick. It puts dents in the ceilings of classrooms and can reach more than 15 meters high. That's one of the more fun parts of the show.
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    Liquid N2 experiments

    Does anyone have any more new ideas?
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    Liquid N2 experiments

    Normally, we try not to kill the people we're trying to give an interest in physics, but if you insist :biggrin: We keep very high standards of safety including special trainings in safety and extensive tests on everything we do, so we're looking for fun, but safe or "can be made safe"...
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    Liquid N2 experiments

    Hello, I'm with a group called RINO (would give you a webiste, but don't have one yet). In Holland we go to schools to do shows with liquid nitrogen. At the moment we're trying to improve our show, so we're thinking about new experiments. I was hoping some of you might have a great suggestion...
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    Trouble with the concept of dimensions and time

    You have to picture it in a 2/3dimensional way to understand it.What I'm trying to show you is that you can never understand the thing it completely is. Consider The following threedimensional world. The world is made out of two pices of paper crossed, so two planes. sideview: +. In both...
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    Time travel and cosmic strings

    What cosmic strings exactly are I don't know, but the tension on them is huge and the energy is because of that. They are strings, so that means that their energy and mass are distributed along a line, apparantly that does something to the space curvature opening possibilities if they were to...
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    Little Help - Every action equal and opposite reaction?

    But bear in mind that the directions are opposite, otherwise you might calculate the speed towards the ground of the gun when you fire the bullet down instead of the speed upwards, making you're calculation useless. (been there done that (in an exam :P)
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    Mid physics crisis

    My classical mechanics teacher put it this way: "The r is an arbitrary unit and must have a length of a minimum of one." In essence it is only valid if r is larger than one in any unit. That means that it is possible to be as small as anything, because you can choose your unit freely, but it...
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    Trouble with the concept of dimensions and time

    Try to think of a dimension as a direction. In what we perceive as the world, we have three directions and time. Time is also a dimension because it has the fundamental concept of having a forward and a backward. The fact that we seem to be moving forward has to do with our brain containing...
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    Polarisation of light! help please!

    Using a polaroid sunglass or something like that, will tell you if it's polarized. If the amount of light transmitted changes when you turn the polaroid glass, then the light is polarized. When the amount of transmitted light is maximal, then the glass has it's axis in line with the...
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