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📘 How a cloud becomes rain

Follow vapor from condensation nuclei through collision, coalescence, and falling rain.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

Start the course →

What you’ll learn

Moisture
Nuclei
Cloud droplets
Collision
Coalescence
Ice process
Falling path
Intensity
Organization
Surface

Questions this course answers

What starts cloud-droplet formation?

Cooling vapor condenses on aerosol particles that provide surfaces for droplets to form.

Why do larger cloud droplets collide with smaller ones?

Different fall speeds create relative motion that enables collisions.

What is coalescence?

Coalescence is the joining of droplets into a larger drop after collision.

How can snow become rain?

Ice precipitation melts when it passes through air above freezing.

Why might radar detect precipitation that never reaches the ground?

Evaporation below the cloud can produce virga before particles reach the surface.

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