Very high temperatures are measured by

Very high temperatures are measured by; option [C] Absolute radiation thermometer. Absolute radiation thermometers, commonly known as pyrometers, determine temperatures by assessing the thermal radiation emitted by an object. They are particularly effective for measuring extremely high temperatures, surpassing the capabilities of other thermometers. This method is based on the principle that all objects emit electromagnetic radiation proportional to their temperature, as described by Planck’s law and the Stefan-Boltzmann law. Absolute radiation thermometers utilize sensors to detect and quantify this emitted radiation, enabling accurate temperature measurements without physical contact with the object.

Absolute radiation thermometers find extensive application in industries such as metalworking, glass manufacturing, and aerospace, where temperatures often exceed the limits of traditional thermometers. They are vital for monitoring processes such as steelmaking, welding, and combustion, where precise temperature control is critical for product quality and safety. Additionally, absolute radiation thermometers are indispensable in scientific research, particularly in fields such as astrophysics and material science, where the study of high-temperature phenomena is essential. Due to their versatility and accuracy in measuring very high temperatures, absolute radiation thermometers are essential tools in numerous industrial and scientific applications.