Agriculture
Getting the dirt on carbon
Silk’s superpowers
Hungry bug seeks hot meal
Amphibians
Salamanders and Newts
Frogs and Toads
Tree Frogs
Animals
Roach Love Songs
Sleepless at Sea
Mating Slows Down Prairie Dogs
Behavior
The Colorful World of Synesthesia
Girls are cool for school
Brain cells take a break
Birds
Chicken
Flightless Birds
Waterfowl
Chemistry and Materials
Revving Up Green Machines
Heaviest named element is official
Silk’s superpowers
Computers
Graphene's superstrength
It's a Small E-mail World After All
Galaxies on the go
Dinosaurs and Fossils
Hall of Dinos
The Paleontologist and the Three Dinosaurs
Supersight for a Dino King
E Learning Jamaica
2014 GSAT Results for Jamaican Kids
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Results of GSAT are in schools this week
Earth
Groundwater and the Water Cycle
Warmest Year on Record
Quick Quake Alerts
Environment
A 'Book' on Every Living Thing
Fishing for Fun Takes Toll
Fungus Hunt
Finding the Past
If Only Bones Could Speak
An Ancient Childhood
Watching deep-space fireworks
Fish
Perches
Manta Rays
Mahi-Mahi
Food and Nutrition
Packing Fat
A Taste for Cheese
Healing Honey
GSAT English Rules
Whoever vs. Whomever
Finding Subjects and Verbs
Pronouns
GSAT Exam Preparation Jamaica
GSAT stars reap scholarship glory
GSAT Exam Preparation
Scotiabank Jamaica Foundation Grade Six Achievement Test (GSAT) Scholarships
GSAT Exams Jamaica Scholarships
GSAT Scholarship
GSAT Practice Papers | GSAT Mathematics | Maths
2014 GSAT Results for Jamaican Kids
GSAT Mathematics
How to Slice a Cake Fairly
Math of the World
Math is a real brain bender
Human Body
Teen Brains, Under Construction
Heavy Sleep
A Long Trek to Asia
Invertebrates
Sea Anemones
Cockroaches
Insects
Mammals
Humpback Whales
Glider
Miscellaneous Mammals
Parents
The Surprising Meaning and Benefits of Nursery Rhymes
How children learn
Children and Media
Physics
Gaining a Swift Lift
Thinner Air, Less Splatter
Einstein's Skateboard
Plants
Assembling the Tree of Life
Underwater Jungles
Plants Travel Wind Highways
Reptiles
Chameleons
Box Turtles
Geckos
Space and Astronomy
Icy Red Planet
Melting Snow on Mars
Catching a Comet's Tail
Technology and Engineering
Weaving with Light
Spinach Power for Solar Cells
Are Propellers Fin-ished?
The Parts of Speech
Countable and Uncountable Nouns
What is a Preposition?
Problems with Prepositions
Transportation
Charged cars that would charge
Where rivers run uphill
Are Propellers Fin-ished?
Weather
In Antarctica watch the heat (and your step)
Polar Ice Feels the Heat
Science loses out when ice caps melt
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™