Why is the atomic theory important3/30/2024 ![]() ![]() They are moving around in three dimensions. Secondly, for simplicity, they are sketchedĪlmost schematically in a two-dimensional arrangement, but of course In theįirst place, the particles are drawn in a simple manner with sharpĮdges, which is inaccurate. Water magnified a billion times, but idealized in several ways. Magnify it another two hundred and fifty times and we will see something In order to see what this teeming is about, we will Looks something like a crowd at a football game as seen from a very Kind of teeming, something which no longer has a smooth appearance-it Now the drop of water extendsĪbout fifteen miles across, and if we look very closely at it we see a We pass on and look still more closely at the water material itself, This, of course, is a subject for biology, but for the present Paramecia with their wiggling cilia and twisting bodies that you go noįurther, except perhaps to magnify the paramecia still more and see You may stop at this point and get so curious about the Still see relatively smooth water-but here and there smallįootball-shaped things swimming back and forth. ![]() Times-then the water drop will be roughly forty feet across, about asīig as a large room, and if we looked rather closely, we would It with the best optical microscope available-roughly two thousand We see nothing but water-smooth, continuous water. Of water a quarter of an inch on the side. To illustrate the power of the atomic idea, suppose that we have a drop For ordinary speeds we can certainlyįorget it and use the simple constant-mass law as a good approximation.īut for high speeds we are wrong, and the higher the speed, the more Practice one might think that the new law makes no significantĭifference. In some such approximate form this is a correct law. Hundred miles a second the mass is constant to within one part in a True law is: if an object moves with a speed of less than one Mass is found to increase with velocity, butĪppreciable increases require velocities near that of light. Was invented: mass is constant, independent of speed. For example, the mass of an object never seems toĬhange: a spinning top has the same weight as a still one. Things, how can the results of an experiment be wrong? Only byīeing inaccurate. But these things are easilyįixed, and checked back and forth. With the apparatus that you did not notice. Now, how can anĮxperiment be “wrong”? First, in a trivial way: if something is wrong ![]() “wrong” ones, and then we find the “right” ones. We said that the laws of nature are approximate: that we first find the Mike The Feynman Lectures on Physics New Millennium Edition ![]() Your time and consideration are greatly appreciated. So, if you can, after enabling javascript, clearing the cache and disabling extensions, please open your browser's javascript console, load the page above, and if this generates any messages (particularly errors or warnings) on the console, then please make a copy (text or screenshot) of those messages and send them with the above-listed information to the email address given below.īy sending us information you will be helping not only yourself, but others who may be having similar problems accessing the online edition of The Feynman Lectures on Physics. This type of problem is rare, and there's a good chance it can be fixed if we have some clues about the cause.
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