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The physics of gurgling

What causes the bubbling sound when drinking from a bottle?When drinking from an inverted bottle, a vacuum starts to appear at the top as water flows out of the bottle. Because of the air pressure outside, air forces its way through the neck of the bottle and bubbles up. This is followed by more water escaping, and more air bubbles moving up. So on and so forth. The glug-glug is caused by these two alternating processes.Does water flow faster at the beginning or near the end?Water flows faster at the beginning because this is when the pressure is highest.Does water flow faster when the bottle is in an inverted position (i.e. upside down) or when it is tilted?(The experiment can be carried out quite easily in a kitchen or bathroom. The result accords with our experience.)Water flows faster when the bottle is tilted, i.e. at an angle. This avoids the gurgling, i.e. air bubbles coming up through the liquid, which obstructs the passage of water.What is the fastest way to pour out water?The fastest way is to pour water at an angle and with a swirl. To create a swirl, move the bottle in small circles before pouring. This way, water moves to the side of the bottle and no gurgling occurs, allowing air to freely enter through the centre (For more details, please click here to read the article written by Hong Kong Observatory) (Information provided by Hong Kong Observatory)

Cultural & Leisure

28-04-2020

One-stop online resources recommended by LCSD

During the fight against COVID-19, the Leisure and Cultural Services Department (LCSD) has launched a special one-stop online resources centre to enrich the lives of the public during this period regardless of whether venues are open or closed. The public can now view or participate in multi-faceted leisure and cultural activities that suit all ages from the comfort of their homes. SportsAppeal and Demonstration by Sports StarsHealthy Exercise for All Campaign - Interactive GameParent-child ActivitiesExercise in the WorkplaceSimple Circuit TrainingEasy Aerobic DanceRope Skipping for Fun MuseumsHong Kong Science Museum - Unlocking the Secrets - The Science of Conservation at The Palace MuseumHong Kong Museum of Art on Google Arts & Culture ProjectHong Kong Heritage Museum on Google Arts & Culture ProjectHong Kong Museum of Art “Classics Remix: The Hong Kong Viewpoint - Animations”ICH On-lineOi! - One minute of VoidOi! - Workout WednesdayRadio Television Hong Kong Journey through the Museums Librariese-Content Highlights: Healthy LivingChildren Picture and Story BooksHong Kong Memory15-Minute Read (Content in Chinese only)Elderly (Content In Chinese only) MusicHong Kong Chinese Orchestra "Together, We Fight the Virus"Hong Kong Chinese Orchestra "Synergizing Hong Kong with Heartening Sound of the Drums"Hong Kong Chinese Orchestra Next Station Moon by Ng King-panHK Phil — Shostakovich: Symphony No. 9 conducted by Jaap van ZwedenHK Phil Europe Tour 2015, Vienna - Musikverein Wien (Full Length)Musicus Fest 2019 — Vivaldi: Concerto for Violin and Cello in B-flat by Stuttgart Chamber Orchestra with Noah Bendix-Balgley (Violin) and Trey Lee (Cello)Premiere Performances of Hong Kong "Beare’s Premiere Music Festival" — Mendelssohn OctetWindpipe Chinese Music Ensemble — Huqin Ensemble: Pacing Horses in the Countryside in Spring TheatreHKRep [Facebook Performace Rewind]World Cultures Festival 2019: Ibsen’s Ghosts: A Play-reading and interactive commentary event by theatre du pif* DanceR&T (Rhythm & Tempo) Tap Dance Lession (1)* Multi-ArtsWorld Cultures Festival 2019 Special outdoor programme: Nobody but a princess… by phase7 performing.artsInteractive Lighting Installation - Magic Behind the Moon by Hung Keung in celebration of 2019 Mid-autumn FestivalCircular Reflection by Hung Keung and Alex Cheung in celebration of opening of the Salisbury Garden Family EntertainmentInternational Arts Carnival 2019: The Nightingale by The Only Stage*BE KIDS Bi Li Ba La Fun Time (1)*Jumbo Kids Theatre's Classroom (1)* *In Cantonese (For more details, please visit LCSD "One-stop online resources centre" webpage)

Cultural & Leisure

14-04-2020

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Keep Clean Be Healthy

A Guide to Personal, Home and Environmental Hygiene