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Geoffrey Morgan. Photo: Ice may look cold but it's an awful lot hotter than absolute zero. In theory, absolute zero is the lowest temperature anything can ever reach. In practice, it's virtually impossible to cool anything down that much—scientists have tried very hard but still not actually reached such a low temperature. Amazing things happen when you get close to absolute zero.

Some materials, for example, can lose virtually all their resistance and become amazing conductors of electricity called superconductors. There's a great PBS website where you can find out lots more about absolute zero and the remarkable things that happen there. Compared to absolute zero, everything in our everyday world is hot because its molecules are moving around and they have at least some heat energy. Everything around us is also at a much hotter temperature than absolute zero.

You can see there's a close link between how much heat energy something has and its temperature. So are heat energy and temperature just the same thing? Let's get this clear:. An object's temperature doesn't tell us how much heat energy it has. It's easy to see why not if you think about an iceberg and an ice cube.

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Both are at more or less the same temperature but because the iceberg has far more mass than the ice cube, it contains billions more molecules and a great deal more heat energy. An iceberg could even contain more heat energy than a cup of coffee or a red-hot iron bar. That's because its bigger and contains so many more molecules, each of which has some heat energy. The coffee and the iron bar are hotter have a higher temperature , but the iceberg holds more heat because it's bigger.

We measure temperature with thermometers using two common and fairly arbitrary scales called Celsius or centigrade and Fahrenheit , named for Swedish astronomer Anders Celsius — and German physicist Daniel Fahrenheit — There's also a scientific temperature scale called the Kelvin or absolute scale , named for British physicist William Thompson later Lord Kelvin, — Logically, the Kelvin scale makes much more sense to scientists because it runs upward from absolute zero which is also known as 0K, without a degree symbol between the zero and the K.

You'll see lots of Kelvin temperatures in physics, but you won't find weather forecasters giving you temperatures that way. Photo: A thermometer measures how hot something is, not how much heat energy it contains. Two objects at the same temperature are equally hot, but one can contain a lot more heat energy than the other.

One thing you've probably noticed about heat is that it doesn't generally stay where you put it. Hot things get colder, cold things get hotter, and—given enough time—most things eventually end up the same temperature. How come? There's a basic law of physics called the second law of thermodynamics and it says, essentially, that cups of coffee always go cold and ice creams always melt: heat flows from hot things toward cold ones and never the other way around. You never see coffee boiling all by itself or ice creams getting colder on sunny days! The second law of thermodynamics is also responsible for the painful fuel bills that drop through your letterbox several times a year.

In short: the hotter you make your home and the colder it is outside, the more heat you're going to lose. To reduce that problem, you need to understand the three different ways in which heat can travel: called conduction, convection, and radiation. Sometimes you'll see these referred to as three forms of heat transfer. Photo: Conduction carries heat from the furnace in the center of this picture into all the pieces of metal that are touching it—making them red hot too. Photo by L. Conduction is how heat flows between two solid objects that are at different temperatures and touching one another or between two parts of the same solid object if they're at different temperatures.

Walk on a stone floor in your bare feet and it feels cold because heat flows rapidly out of your body into the floor by conduction. Stir a saucepan of soup with a metal spoon and you'll soon have to find a wooden one instead: heat travels rapidly along the spoon by conduction from the hot soup into your fingers. Picture: How convection pumps heat into a saucepan. The pattern of warming, rising soup red arrows and falling, cooling soup blue arrows works like a conveyor that carries heat from the stove into the soup orange arrows.

Convection is the main way heat flows through liquids and gases. Put a pan of cold, liquid soup on your stove and switch on the heat. The soup in the bottom of the pan, closest to the heat, warms up quickly and becomes less dense lighter than the cold soup above. The warmer soup rises upward and colder soup up above it falls down to take its place.

Pretty soon you've got a circulation of heat running through the pan, a bit like an invisible heat conveyor, with warming, rising soup and cooling, falling soup. Gradually, the whole pan heats up.

Convection is also one of the ways our homes heat up when we turn on the heating. Air warms up above the heaters and rises into the air, pushing cold air down from the ceiling.

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Before long, there's a circulation going on that gradually warms up the entire room. Picture: Infrared thermal images sometimes called thermographs or thermograms show that all objects give off some heat energy by radiation. In these two photos, you can see a rocket on a launch pad photographed with a normal camera above and an infrared thermal camera below.

The coldest parts are purple, blue, and black; the hottest areas are red, yellow, and white.


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Photo by R. Radiation is the third major way in which heat travels.

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16 Geothermal

Conduction carries heat through solids; convection carries heat through liquids and gases; but radiation can carry heat through empty space—even through a vacuum. We know that much simply because we're alive: almost everything we do on Earth is powered by solar radiation beamed toward our planet from the Sun through the howling empty darkness of space. But there's plenty of heat radiation on Earth too.

Although global copper mine production increased around 1. Many base metals, copper especially, rely heavily on orders from China, the top purchaser of the red metal. The world's second biggest economy accounts for 40 percent of all copper consumption, but this figure might be threatened the longer its manufacturing sector remains at lukewarm levels. Although the preliminary purchasing manager's index PMI reading rose slightly in June to About 60 percent of the copper China purchases goes toward the property sector, an area that's finally starting to show signs of life after almost a year of falling prices.

A bright spot for copper demand, however, is the eurozone, whose own flash PMI hit a month high of The expansion was led by Germany and France, which saw output rising at its sharpest rate since August In the coming years, more and more people all over the globe will gain access to electricity, a growing percentage of which we will derive from renewable sources. Think about the impact that will have on all of our resources. Many of these people live close to the equator. When they begin to have more wealth, they live in more comfort.

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One of the first things they acquire is an air conditioning unit, or a refrigerator as they eat a protein-based diet. However, whether it's a need or a want, the backbone of their future consumption footprint is energy, and, more specifically, electricity. And along for the ride, whether in fossil-fuel power plants or wind turbines, will be copper. World globe An icon of the world globe, indicating different international options.

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