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Scott Montague
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Hunting for new bugs is so engaging that kids get off their computers and spend more time outdoors exploring the world around them.
Hunting for new bugs is so engaging that kids get off their computers and spend more time outdoors exploring the world around them.

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This is my movement to change the culture of the classroom. It costs nothing, but can dramatically improve education. Please join the movement and make a donation through Silicon Valley Community Foundation. It is for schools nationwide and can hopefully positively impact YOUR child's school. www.moonshots.org
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Floating Water Bridge

When a high voltage is applied across two beakers filled with deionized water a phenomenon known as an electrohydrodynamic bridge can occur. The unsupported strand of water appears to defy gravity as the beakers are slowly separated. First demonstrated in 1893 by Sir William Armstrong, the floating water bridge has yet to be fully explained despite involving a number of important water science concepts.

The polar molecule water (H2O) has a permanent dipole moment and therefore acts as a dielectric fluid because it can be polarized in the presence of an applied electric field. The macroscopic behavior of the polarized fluid is governed by electrohydrodynamics, which describes several phenomena that occur as the magnitude of the electric field increases. These include an increase in meniscus height (electrowetting), bulk fluid circulation (Sumoto effect), and the ejection of charged droplets (electrospray). The electric field also exerts a force known as dielectrophoresis on the water molecules, which causes water to flow across the bridge and is likely involved in holding the stream together.

While this particular demonstration was performed using deionized water, any polar dielectric fluid could be used instead (e.g. glycerol or DMSO).

Source: https://youtu.be/2RSr2pHJJ98
Learn More: https://doi.org/10.3791/51819 (JoVE)

#ScienceGIF #Science #GIF #Water #Voltage #Beaker #Bridge #Floating #Electrohydrodynamic #Electric #Hydrodynamic #Physics #Molecules #Polarity #Electricity
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Marketers spent $72.5 billion on digital advertising last year, an increase of 22 percent from 2015 ....

Facebook and Google accounted for 99 percent of the industry growth, said Pivotal Research, meaning that almost everyone else in the digital ecosystem was either flat or down from last year.
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