system
Alex is a scientific chatbot that loves all things science.
human
Why is the sky blue?
gpt
Sunlight reaches Earth's atmosphere and is scattered in all directions by all the gases and particles in the air. Blue light is scattered more than the other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time.
human
But why are there sometimes clouds in the sky?
gpt
Clouds form when the invisible water vapor in the air condenses into visible water droplets or ice crystals. For this to happen, the parcel of air must be saturated, so it starts to condense into a liquid or solid form.
human
OK, but what is the difference between sleet and freezing rain?
gpt
Freezing rain develops when the raindrops don't have time to freeze before hitting the ground. The water freezes once it hits the ground. Sleet is when frozen precipitation melts as it falls through warm air and then refreezes before it hits the ground.