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🛑 Stop being hit by the curry vendor. Decode the Durian knock physics.

Today, the science mate has a tip for the "science boy"! We will decipher the Durian seller's secret. Just using the physics principle of "Resonance," you can immediately know which is soft and which is raw!

Do you know why the sounds of 'paste' and 'puff' are different? The secret is purely "inner structure"! 🤫

Raw Durian 🍈: The meat is still hard and clings to the shell, there is no space for air to penetrate. When we knock, the sound waves vibrate quickly, causing a high frequency, the sound that goes into our ears, so it comes out in a ton of solid pieces like "paste."

🤤 Durian Ripe: When the meat starts to ripen softly, the Durian meat shrinks a little bit, creating an "air gap" between the meat and the shell! Now, when we knock, this air gap acts like a larynx, a resonance, a decrease in the frequency of the sound, a greater wavelength, so the sound that is heard becomes a reverberation of "puff"!

This is a trick that can be described purely by science. Save this photo and post. Keep it open for viewing on the Durian panel. This summer, the science mate warrants the exact texture, the outer frame is soft in, definitely not curried! 💛✨

# ScienceMate # Dracula Science Library # Physics # Science around # How to choose durian /สถาบันเทคโนโลยีดิจิทัลวิทยาศาสตร์บริการ

4/23 Edited to

... Read moreจากประสบการณ์ส่วนตัวในการเลือกทุเรียนเอง ทุกครั้งที่ไปซื้อหน้าร้านหรือบนแผงขายทุเรียน วิธีเคาะลูกทุเรียนแล้วฟังเสียงนั้นเป็นเทคนิคที่ทำได้ง่ายและเร็วมาก ช่วยให้เราสามารถแยกได้ว่าทุเรียนลูกไหนเนื้อสุกนุ่ม หรือยังดิบแน่นอยู่ โดยไม่ต้องพึ่งดมกลิ่นหรือสัมผัสเพียงอย่างเดียว สิ่งที่น่าสนใจคือ หลักฟิสิกส์ในเรื่องคลื่นเสียงและการกำทอน (Resonance) ที่ทำให้เสียงเคาะออกมาแตกต่างกันอย่างชัดเจน ระหว่างทุเรียนดิบที่มีเสียงแหลม ๆ ตัน ๆ แบบ "แปะๆ" กับทุเรียนสุกที่เสียงทุ้มก้องแบบ "ปุๆ" ทุเรียนดิบมีโครงสร้างเนื้อที่แน่น เนื้อเกาะติดกับเปลือกไม่มีช่องว่าง ทำให้คลื่นเสียงสั่นสะเทือนเร็วและมีความถี่สูง ส่วนทุเรียนสุกเนื้อจะหดและเกิดช่องว่างอากาศระหว่างเนื้อกับเปลือก ช่องว่างนี้ทำหน้าที่เหมือนโพรงเสียง เพิ่มการกำทอนเสียง ความถี่เสียงต่ำลงและความยาวคลื่นเพิ่มขึ้น เหตุนี้เสียงทุเรียนสุกจึงก้องกังวานและรู้สึกได้ถึงความนุ่มของเนื้อ เทคนิคนี้จึงเหมาะกับผู้ซื้อที่อยากได้ทุเรียนเนื้อเป๊ะ ๆ กรอบนอกนุ่มใน โดยเฉพาะในช่วงหน้าร้อนหรือหน้าทุเรียนที่ต้องเลือกให้เหมาะกับความต้องการ เช่น ต้องการทุเรียนสุกพร้อมทานทันที หรือชอบทุเรียนที่สุกแต่ยังมีเนื้อสัมผัสแน่นหน่อย นอกจากเสียงแล้ว การจับสัมผัสเนื้อทุเรียนผ่านเปลือก ก็ช่วยยืนยันความนุ่มของเนื้อได้มากขึ้น โดยเฉพาะในกรณีที่เสียงเคาะฟังยากในสภาพแวดล้อมที่มีเสียงรบกวนมาก เทคนิคนี้ยังสามารถประยุกต์ใช้กับผลไม้ที่มีโครงสร้างเนื้อและเปลือกแบบเดียวกันได้อีกด้วย สุดท้าย การเข้าใจหลักฟิสิกส์เหล่านี้นอกจากช่วยประหยัดเงินไม่ต้องโดนแม่ค้าแกงแล้ว ยังทำให้เราเลือกซื้อทุเรียนได้อย่างสนุกสนานและได้ความรู้ทางวิทยาศาสตร์รอบตัวติดตัวไปด้วย

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