upper critical temp. means 273k and lower temp. means -273k.now 50 deg cent. above upper cri. temp means 273+50 deg cent.(=273+323)kelvin
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The upper critical temperature of steel is around 1370°C (2498°F) and the lower critical temperature is around 723°C (1333°F). These temperatures are important in heat treatment processes to control the microstructure and properties of steel.
Full annealing involves heating a material above its critical temperature and then slowly cooling it in a furnace, while isothermal annealing involves heating the material above its critical temperature and then holding it at a specific temperature for a set period of time before cooling. Isothermal annealing is used to achieve a more uniform microstructure compared to full annealing, which can result in better mechanical properties.
The temperature range is from -50 to 0 degrees, where -50 degrees is the lower limit and 0 degrees is the upper limit. The temperature is in the negatives and ranges from extremely cold to freezing.
The lower fixed point of a clinical thermometer is the temperature of the ice point (0°C) and the upper fixed point is the temperature of the steam point (100°C at standard atmospheric pressure). These fixed points are used to calibrate the thermometer for accurate temperature measurements.
The upper fixed point in a clinical thermometer is typically the temperature of a healthy human body (e.g., 37 degrees Celsius). The lower fixed point is usually the temperature of melting ice (e.g., 0 degrees Celsius). These fixed points help calibrate the thermometer for accurate temperature measurements.
Temperature tends to decrease as elevation increases in mountains. This is due to a combination of factors, including the thinner air at higher altitudes which can't trap heat as effectively, as well as the cooler air that flows down the slopes from the upper regions.