Geekswipe

Swipe science here—https://geekswipe.net.

[spaceexp]

Just in case a #Soyuz lands near you, on one side of the capsule there are instructions about how you let the cosmonauts out. Also, a Kaktus precision γ-ray altimeter is the reason for the radiations warning

via reddit

[geekswipe-blog]

Royal Air Force GR4 Tornado flying through a rainbow | Cambrian Mountains, Wales | Photographer: Anonymous

[spaceexp]

History of Space Travel poster.

[geekswipe-blog]

Nucleation centres are responsible for creating the initial air pockets inside the container in which the liquid is boiled. So when the liquid reaches its boiling point, the already existing air pocket at the nucleation centre aids the other molecules to...

Why liquids need a nucleation centre to initiate boiling?

[fuckyeahfluiddynamics]

If you place a droplet on a surface much hotter than its boiling point, that droplet will skitter and float almost frictionlessly across the surface on a thin layer of its own vapor. This is what is known as the Leidenfrost effect. But you don’t have to heat a surface to get this behavior. There’s also an aerodynamic Leidenfrost effect, shown above, when the surface is moving. As the surface moves, it drags a layer of air along with it, and that layer of air is capable of keeping droplets aloft indefinitely. The thickness of the air layer depends on speed; the faster the plate moves, the thicker the air layer underneath droplets. The aerodynamic forces generated are large enough to drive a droplet up an incline against the force of gravity (bottom image). (Image credit: animation - M. Saito et al., source; chronophotograph - A. Gautheir et al., pdf)

[fuckyeahfluiddynamics]

In recent years, astronauts have reported their vision changing as a result of long-duration spaceflight. Pre- and post-flight studies of astronauts’ eyes showed flattening along the backside of the eyeball, and scientists hypothesized that the redistribution of body fluids that occurs in microgravity could be reshaping astronauts’ eyes by increasing the intracranial pressure in their skulls. 

A new study tested this hypothesis with the first-ever measurements of intracranial pressure during microgravity flights and during extended microgravity simulation (a.k.a. bedrest with one’s head pointed downward). The authors found that humans here on Earth experience substantial changes in intracranial pressure depending on our posture – while upright we experience much lower intracranial pressure than we do when we’re lying flat. In both microgravity flights and simulation, patients had intracranial pressures that were higher than earthbound upright values but lower than what is experienced when lying flat on Earth. 

Since we humans on Earth spend about 2/3rds of our time upright and 1/3rd prone, our bodies are accustomed to regular variations in intracranial pressure. In space, astronauts don’t receive that regular unloading of intracranial pressure we have when we’re upright. So now researchers suggest that it is the lack of daily variation in intracranial pressure that is the culprit behind astronauts’ vision changes – not the absolute value of the pressure itself. (Image credit: NASA; N. Alperin et al.; research credit: J. Lawley et al.)

[geekswipe-blog]

This blog supports honey 🍯 and of course, bees 🐝!

[fyphysica]

Ripple tank experiments

Ripple tanks are really cool ways to explore the way a wave behaves under the influence of a perturbation.

They are fairly simple to make, and are usually available in college and school laboratories to render better understanding of the wave phenomenon.

How does it work ?

                   Source

There is a usually an oscillating paddle( above- used to produce plane waves) or a point source/s ( below - used to produce circular waves ) which are actuated by eccentric motors, solenoids, etc + a shallow tank of water.

And that’s about it! One is ready to visualize wave phenomenon

Here are some of my favorite renditions of physical phenomenon on a ripple tank. Check sources for more. Enjoy!

1. Diffraction

2.Double slit experiment

3. Reflection

4. Refraction

5. Parabolic Reflectors

A gif is worth a thousand pages. :D

* Since the maximum gif size that one can upload on Tumblr is 2 Mb, the images had to be resized. The unedited album of gifs has been uploaded to Imgur (click here) if you are interested :D

** Source videos : Educational Services Inc-1964  and Aerodynamic generation of sound

[fyphysica]

Next in this series : The beauty of interference.

Have a great day!

[geekswipe-blog]

A GIF is worth...

[unsympatheticchemprof]

[geekswipe-blog]

Explore the primary issues in growing plants on Mars, and learn about the solutions to fix those issues that could successfully spark a Martian terraforming in the near future.

[geekswipe-blog]

A life or career without curiosity is nothing less than a vitality of a rock. There's only one life. But many choices. Choose wisely.

K

[geekswipe-blog]

*plays - Also sprach Zarathustra*

[geekswipe-blog]

Are you a night owl? Batman? Or a vigilante who lives a double life? Read this!