Which material has low emissivity?

Which material has low emissivity?

Which material has low emissivity? A) Human skin B) Black paint C) Polished aluminum D) Rubber Answer: C) Polished aluminum Emissivity describes how effectively a surface emits infrared radiation compared to an ideal blackbody (which has a value of 1). In thermography, this property is critical because thermal cameras don’t directly measure temperature—they detect infrared radiation and then estimate temperature based on emissivity settings. If emissivity is misunderstood or set incorrectly, the temperature reading can be significantly wrong. Materials like human skin, black paint, and rubber all have relatively high emissivity values, typically in the range of about 0.85 to 0.98. That means they emit most of the thermal energy they absorb, making them easier and more reliable targets for infrared measurement. For example, human skin has an emissivity close to 0.98, which is why thermal imaging works well for medical or human detection applications. Black paint behaves similarly because dark…