Water in a lake would always be at the bottom, so ice would form first at the bottom.Įf ice were also more dense than liquid water, the lake would freeze from the bettom Jf the thermal expansion coefficient of water were always positive, then the coldest The smallest ponds freeze completely from top to bottom. The rest of the water from the cold weather, so even during a long, cold winter, only The first water to freeze will therefore be at the top Īnd since ice is even less dense, the ice floats on the surface. Below 4☌, this means that the warmer water will (b) As the water in a lake cools, the densest water will sink to the bottom and the lessĭense water will rise to the top. Mercury, even with the optical magnification of the glass! No wonder it’s so hard to see the column of That the tube is cylindrical, its radius would have to beĨ0 its diameter would be only 0.04 mm. Length of a 1☌ increment on the scale) and unknown cross-sectional area. The expansion, however, takes place inside a narrow tube with a length of 8.5 mm (the For enother example, see the quote on page 48. It sucks heat out of my feet much more slowly due to its relatively poor thermal contactĪnd low heat capacity. In fact the rug is just as cold as the tub, but That is pretty well insulated from the weather. The same temperature, since they’ve been right next to each other all night long in a room Shower, the tub feels a lot colder to my feet than the rug. Problem 1.6, On a cold morning, when I step from the bathroom rug inte the tub for my The “relaxation time” could therefore be anywhere from 10 or 20 seconds te three minutes, Want a reading that is accurate to within a fraction of a degree. Temperature within 10 or 20 seconds waiting three minutes is necessary only because we However, the bulb of the thermometer must come most of the way up to body 1 was taught to leave the thermometer in my mouth for at least three The sun’s surface is 20 times room temperature and so on.
“twice as hot” makes perfect sense: the melting point of lead is twice room temperatures But if we measure temperatures from absolute zero, then There's no fundamental sense, for instance, in “Twice as hot” on the Celsius (or Fahrenheit) scale would make no sense,īecanse the zero point is chosen arbitrarily. Download Solutions Manual: Daniel Schroeder Introduction to Thermal Physics and more Thermal Physics Exercises in PDF only on Docsity!Chapter 1 Energy in Thermal Physics
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