tungsten
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Materials with melting points in that temperature range include tungsten (melting point of 3422°C), iridium (melting point of 2446°C), and osmium (melting point of 3033°C). These metals have high melting points and could withstand temperatures within the given range without melting.
With a temperature like that, the better question would be what doesn't melt. 12K Celsius is hotter then the surface of the sun, you'd have a hard time finding anything that could withstand that.
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In fact, 8000ºC is hotter than the Sun's surface: 5000ºC. All known elements would be vapour at these temperatures.
All of them. Elements don't break down chemically due to temperature.
Oxygen, for example, is a gas at room temperature and normal atmospheric pressure. At 2000 degrees and standard pressure, it's still a gas. No change.
Generally speaking, anything that is a solid at room temperature has a melting point above room temperature.
The Earth's interior is hot, with temperatures increasing with depth. The outer core is estimated to be around 4400 degrees Celsius (8000 degrees Fahrenheit), while the inner core is even hotter at approximately 5700 degrees Celsius (10,300 degrees Fahrenheit). However, the surface temperature of the Earth can vary greatly depending on location and climate conditions.
There are 8000 milligrams in 8 micrograms because 1 milligram is equal to 1000 micrograms.
There are 8 meters in 8000 millimeters. This is because there are 1000 millimeters in a meter, so you would divide 8000 by 1000 to get the answer.
There are approximately 2438.4 meters in 8000 feet.
8000 mph is approximately Mach 10.5 under standard conditions.