Buying durian is always more nerve-wracking than buying a lottery ticket! 🤣 Has anyone ever stood confused in front of a durian stall because you don’t know how to interpret the thumping sound? 🙋‍♀️

Today, STLC Science Mate has a tip from “science students”! We are going to decode the secrets of durian vendors. By simply applying a basic physics principle near us—“Sound and Resonance”—you can tell instantly which one is ripe and soft, and which one is still rock hard!

Do you know why the “slap-slap” (แปะๆ) and “thud-thud” (ปุๆ) sounds are different? The secret lies entirely in the “internal structure”! 🤫

• 🍈 Raw Durian: The flesh is still hard and tightly attached to the rind, leaving no air gaps. When tapped, the sound waves vibrate quickly, creating a high frequency. The sound that hits our ears comes out sharp, flat, and solid—sounding like “slap-slap” (แปะๆ).

• 🤤 Ripe Durian: As the flesh ripens and softens, it shrinks slightly, creating an “air pocket” between the flesh and the rind! Now, when tapped, this air pocket acts like a vocal tract/sound box, causing Resonance. This lowers the sound frequency and lengthens the wavelength. The sound you hear becomes deep, hollow, and resonant—sounding like “thud-thud” (ปุๆ)!

This is the vendor’s secret explained purely through science. Save this image and post to look at when you’re at a durian stall. This summer, STLC Science Mate guarantees you’ll get perfect, crispy-on-the-outside, soft-on-the-inside durian without being tricked! 💛✨

📚 Anyone interested in exploring more fun physics theories like this can come search for data and use our services at the Dr. Tua Lapanukrom Science Library. We have refreshing air conditioning to welcome you away from the summer heat, along with plenty of books and academic databases!

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