StarTalk Radio Thing You Thought You Knew – Red Hot, Blue Hot
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Feb 10, 2026 They visualize how tiny molecules really are and play with Avogadro’s mind-bending scale. They explain why hotter objects shift from red to blue and why photographers call light “warm” or “cool.” They trace how food spoils, from microbes to quantum effects and preservation tricks like irradiation and vacuum sealing.
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Molecules Outnumber Macroscopic Things
- A single cup of water contains more molecules than there are cups of water in all Earth's oceans.
- That means you share microscopic water molecules with historical figures and everyone else over time.
Your Breath Joins Global Air
- A single breath contains more air molecules than there are breaths in Earth's atmosphere.
- Exhaled molecules disperse and will populate future breaths across the planet.
Color Tracks Temperature In Physics
- Hotter objects emit shorter-wavelength light, shifting from infrared to red, white, then blue as temperature rises.
- Thus in physics, blue corresponds to hotter and red to cooler among glowing objects.
