אורז מוקפץ - מדע וטבע

אורז מוקפץ

מה צריך?

אורז לא מבושל

זוג מקלות אכילה צמודים, או מקל אחד, או עיפרון

בקבוק פלסטיק

משפך או דף נייר

מה עושים?

מלאו את הבקבוק עד הסוף בגרגירי האורז. כדאי להיעזר במשפך, או בנייר שמגולגל לצורת חרוט.

הכניסו את מקלות האכילה לתוך האורז.

טפחו בעדינות בבקבוק על השולחן ותראו שמפלס האורז יורד. הוסיפו לבקבוק עוד גרגירי אורז. כעת, נסו להרגיש אם מקלות האכילה תפוסים חזק. אם לא, הוסיפו אורז. כאשר תרגישו אחיזה חזקה במקלות, הרימו בעזרתם בזהירות את הבקבוק.

מה קורה פה?!

כאשר אתם מכניסים את מקלות האכילה לבקבוק האורז, הם תופסים מקום נוסף בתוך הבקבוק. מכיוון שאורז אינו נוזלי, ומתקשה מאוד לנוע במעלה צוואר הבקבוק (כדי לפצות על המקום שתופסים מקלות האכילה), יש לו מעט מאוד מקום לזוז בתוך הבקבוק, ולכן הוא נוטה להילחץ אל הדפנות.

לפני שמילאתם בשנית את הבקבוק, הוא היה מלא לא רק באורז, אלא גם באוויר. הטפיחות על השולחן פינו מקום לאורז נוסף. כאשר האורז היה דחוס באמת, הגרגירים הצטופפו, נצמדו ואחזו במקלות בחוזקה. האחיזה של האורז התחזקה עד שהחיכוך בין האורז למקלות היה כל כך גדול, שהצלחנו להרים את הבקבוק!

הידעתם?

מקלות אכילה קיימים ונמצאים בשימוש לפחות מאז ששלטה בסין שושלת שאנג, כלומר מלפני כ־3,500 שנים!

שיתוף:

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