Final answer:
The thermosphere is not the hottest layer of the atmosphere. The troposphere is the hottest layer that humans can feel, while the thermosphere can have extremely high temperatures that feel cold due to the low density of air.
Step-by-step explanation:
The thermosphere is not the hottest layer of the atmosphere. The highest temperatures in the atmosphere are actually found in the thermosphere. However, the low density of air in the thermosphere means that these high temperatures would not feel hot to us as humans. In fact, the thermosphere can have temperatures of thousands of degrees Celsius, but because there are so few air molecules to transfer heat to our bodies, it would feel very cold.
The hottest layer of the atmosphere that we can feel as humans is actually the troposphere, which is the lowest layer. This is where weather occurs and where we live. As you go higher in the troposphere, the temperature decreases consistently, so the surface is typically warmer than the upper parts of the troposphere.