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Informally, Alfvén's theorem refers to the fundamental result in ideal magnetohydrodynamic theory that electrically conducting fluids and the magnetic fields within are constrained to move together in the limit of large magnetic Reynolds numbers (R m)—such as when the fluid is a perfect conductor or when velocity and length scales are infinitely large.
Leidenfrost droplet Demonstration of the Leidenfrost effect Leidenfrost effect of a single drop of water. The Leidenfrost effect is a physical phenomenon in which a liquid, close to a solid surface of another body that is significantly hotter than the liquid's boiling point, produces an insulating vapor layer that keeps the liquid from boiling rapidly.
In clouds warmer than about −37 °C where liquid water can persist in a supercooled state, ice nuclei can trigger droplets to freeze. [ 1 ] Contact nucleation can occur if an ice nucleus collides with a supercooled droplet, but the more important mechanism of freezing is when an ice nucleus becomes immersed in a supercooled water droplet and ...
As a result of the 380 illnesses and six deaths of people across the United States from vaping cannabis or e-cigarettes, consumers, vape makers, and retailers alike have to be aware of how ...
E-cigarette vapor is made up of fine and ultrafine particles of particulate matter. [55] Vaping [notes 7] generates particulate matter 2.5 μm or less in diameter (PM 2.5), but at notably less concentrations compared to cigarette smoke. [55] Particle concentrations from vaping ranged from 6.6 to 85.0 μg/m 3. [53]
Not only is scraping your car windows a messy, cold job, but sometimes despite your best efforts, the ice just won't budge. Plus, most car defrosters just aren't speedy enough when the clock is ...
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A college football player with a history of sexual assault raped a 17-year-old girl aboard a Carnival Cruise ship as she was celebrating the holidays with her family — before heartlessly asking ...