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Why is it on hot days, I can stick my hand out a car window while driving and feel a cool breeze?

Mark Sterling
Mark Sterling
Research Editor · Apr 2, 2026 · Updated Apr 13, 2026

The air outside the car isn't at 100% relative humidity. There's room for it to absorb more water by evaporation. So as you stick your sweaty disgusting paw out your window, the water on your nasty mitts gets evaporated quickly as it is exposed to a great deal of air in a hurry.

60
Words

1 min
Read Time

#250
of 500 in Psychology

-12%
vs Category Avg

The Short Answer

The air outside the car isn't at 100% relative humidity. There's room for it to absorb more water by evaporation. So as you stick your sweaty disgusting paw out your window, the water on your nasty mitts gets evaporated quickly as it is exposed to a great deal of air in a hurry. Evaporation causes cooling, so your hand cools down.

Analysis

Key Concepts: Water, evaporation, outside

This explanation focuses on water, evaporation, outside and spans 60 words across 4 sentences. The depth is typical for Psychology questions (category average: 68 words), striking a balance between accessibility and completeness.

What This Answer Covers

The explanation opens with: “The air outside the car isn't at 100% relative humidity.” It then elaboratesultimately building toward a complete picture across 4 connected points.

How This Compares in Psychology

Ranked #250 of 500 Psychology questions by answer depth (top 51%). This falls in the detailed tier — above average depth. The explanation goes beyond surface-level but keeps things accessible.

Frequently Asked Questions

Is there a simple explanation for why it on hot days, i can stick my hand out a car window while driving and feel a cool breeze?

The air outside the car isn't at 100% relative humidity. There's room for it to absorb more water by evaporation. So as you stick your sweaty disgusting paw out your window, the water on your nasty mitts gets evaporated quickly as it is exposed to a…

How detailed is this explanation compared to similar Psychology questions?

This is an above-average answer at 60 words, ranked #250 of 500 Psychology questions by depth. The key concepts covered are water, evaporation, outside.

What approach does this answer take to explain it on hot days, i can stick my hand out a car window while d?

The explanation uses root cause analysis across 60 words. It is categorized under Psychology and addresses the question through 1 analytical lens.