Agriculture
Getting the dirt on carbon
Fast-flying fungal spores
Got Milk? How?
Amphibians
Salamanders
Salamanders and Newts
Frogs and Toads
Animals
Tool Use Comes Naturally to Crows
The Littlest Lemurs
New Elephant-Shrew
Behavior
GSAT Mathematics Quiz, Teaching Math, teaching anxiety
Taking a Spill for Science
Meet your mysterious relative
Birds
Ducks
Eagles
Blue Jays
Chemistry and Materials
Sugary Survival Skill
The hungry blob at the edge of the universe
Flytrap Machine
Computers
New eyes to scan the skies
Look into My Eyes
Galaxies far, far, far away
Dinosaurs and Fossils
Dino-bite!
Dinosaur Dig
Hunting by Sucking, Long Ago
E Learning Jamaica
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Results of GSAT are in schools this week
2014 GSAT Results for Jamaican Kids
Earth
Detecting an Eerie Sea Glow
Ancient Heights
Salty, Old and, Perhaps, a Sign of Early Life
Environment
Improving the Camel
Pumping Up Poison Ivy
Whale Watch
Finding the Past
Watching deep-space fireworks
Meet your mysterious relative
The Puzzle of Ancient Mariners
Fish
Electric Eel
Sharks
Whale Sharks
Food and Nutrition
Eat Out, Eat Smart
In Search of the Perfect French Fry
Moving Good Fats from Fish to Mice
GSAT English Rules
Who vs. Whom
Problems with Prepositions
Adjectives and Adverbs
GSAT Exam Preparation Jamaica
March 21-22, 2013: Over 43,000 students will take the GSAT Exam
How are students placed after passing the GSAT exam
Ministry of Education Announces 82 GSAT Scholarships for 2010
GSAT Exams Jamaica Scholarships
Results of GSAT are in schools this week
2014 GSAT Results for Jamaican Kids
Access denied - Disabled boy aces GSAT
GSAT Mathematics
A Sweet Advance in Candy Packing
Losing with Heads or Tails
42,000 students will sit for the GSAT Exam in two weeks
Human Body
A Better Flu Shot
A New Touch
Attacking Asthma
Invertebrates
Moths
Flies
Camel Spiders
Mammals
Shih Tzus
Bloodhounds
Elephants
Parents
How children learn
What Not to Say to Emerging Readers
Raise a Lifelong Reader by Reading Aloud
Physics
Road Bumps
Strange Universe: The Stuff of Darkness
IceCube Science
Plants
Nature's Alphabet
Tracking the Sun Improves Plant Pollen
Cactus Goo for Clean Water
Reptiles
Komodo Dragons
Chameleons
Garter Snakes
Space and Astronomy
A Galaxy Far, Far, Far Away
Holes in Martian moon mystery
Zooming In on the Wild Sun
Technology and Engineering
Spinach Power for Solar Cells
Dancing with Robots
Reach for the Sky
The Parts of Speech
What is a Verb?
Pronouns
What is a Noun
Transportation
Tinkering With the Basic Bike
How to Fly Like a Bat
Middle school science adventures
Weather
The solar system's biggest junkyard
A Dire Shortage of Water
Either Martians or Mars has gas
Add your Article

Thinner Air, Less Splatter

If you could slow down time, you'd be amazed at the things you could see. In slow motion, for example, you could watch individual drops of rain landing in puddles and making mini-splats. Scientists have been able to observe this process by using cameras that take thousands of pictures every second. Such photos give them the ability to see what our eyes are too slow to catch. Pictures of splashing milk droplets, in particular, have been popular ever since the 1930s, when technology made it possible to capture them. A new experiment adds another twist to these frozen moments in time. Changing the air pressure around a droplet affects the kind of splash it makes. For the study, researchers from the University of Chicago used a sealed chamber that let them change the air pressure inside. At different air pressures, they allowed alcohol drops to fall onto glass slides. They filmed each trial at 47,000 video frames per second. Their results showed that drops hit with smaller splats or no splashing at all when the air pressure was lower than normal. When the scientists increased the air pressure, drops splattered more readily. The researchers also discovered that filling the chamber with lighter gases, such as helium, led to smaller splats compared to ones in the presence of heavier gases. To explain their results, the scientists suggest that, as a drop flattens when it comes in contact with a surface, it spreads out along its edges and pushes against a thin layer of the surrounding gas. The gas resists being trapped, which forces the film's edge upward. This interaction creates the splash. When air pressure is low or the gas is light, the gas can't resist as strongly, and the splat is weaker or never forms in the first place. The scientists were surprised by their discovery. "I don't think anyone ever thought poor little old air could do anything to the splash," says physicist Sidney R. Nagel, who led the Chicago team. Engineers are interested in the work, too. In industry and at home, splashing affects the quality of important processes, including ink-jet printing, engine combustion, and product washing. Finding ways to control the size of a splat could make such jobs a lot more efficient.E. Sohn

Thinner Air, Less Splatter
Thinner Air, Less Splatter








Designed and Powered by HBJamaica.com™