The sky appears blue over Asia, despite there being a significant amount of land, due to a phenomenon called Rayleigh scattering. When sunlight passes through Earth's atmosphere, it interacts with the gas molecules and scatters in different directions.
The Earth's atmosphere is made up of various gases, such as nitrogen and oxygen. These gas molecules are much smaller than the wavelength of visible light. Blue light has a shorter wavelength and higher energy compared to other colors in the visible spectrum. When sunlight enters the atmosphere, the blue light is scattered more than other colors because it interacts more with the smaller gas molecules.
Since Asia has a large landmass, the sunlight passes through a substantial portion of the atmosphere, causing the blue light to scatter more. This scattered blue light is what we perceive as the blue color of the sky.
It's important to note that the sky can appear different colors at different times of the day or under specific weather conditions. For example, during sunrise or sunset, the sky may appear redder because the sunlight has to pass through a thicker portion of the atmosphere, causing more scattering of shorter wavelengths like blue and violet. Additionally, weather conditions such as pollution or dust particles can affect the color of the sky.
In summary, the sky appears blue over Asia due to Rayleigh scattering, which is caused by the interaction between sunlight and gas molecules in Earth's atmosphere. The smaller gas molecules scatter the shorter wavelengths of blue light more, leading to the perception of a blue sky.