Making liquid nitrogen is hard – in fact up until 150 years ago scientists doubted whether it was even possible to liquefy nitrogen. In 1823, At the royal institution in London, Michael Faraday first produced liquid chlorine, kind of accidentally by putting it under high pressure. He similarly liquefied ammonia. Continue reading
From sand and gravel to rock salt and magnesium chloride, the people who maintain our roads are constantly searching for the most most innovative ways to keep our road clear of snow and ice. Our science guy Steve Spangler looks at the science of de-icing with a cool experiment you can try at home. Continue reading
Fish living in the oceans around Antarctica seem like they should freeze to death. But notothenioids have it all figured out, thanks to the antifreeze proteins in their blood! Continue reading
Snowflakes are infinitely beautiful, but are they infinitely unique? Here’s all the science behind Earth’s favorite cold crystal. Continue reading
Halloween is the perfect time for oozing, bubbling, eye-catching science! If you love to perform science demonstrations, Halloween is a wonderful excuse to fill the cooler with dry ice and get ready for a day filled with “ooze” and ahhhs! Great Halloween Science! Continue reading
The boiling point of a liquid depends on the external air pressure. When water is placed under vacuum, the boiling point decreases and the water boils. Boiling, however, is an endothermic process—as the water boils, the temperature decreases, and the water soon freezes!
In this demo, pressure changes cause a sample of acetone freezes while still boiling.
Click here for the complete instructions, courtesy of Flinn Scientific
Many children can identify that water exists in 3 states within our natural environment. Understanding that it is the very same water that undergoes changes of state presents far more of a challenge to children in grade 2. The following experiment is simple yet effective in helping children understand changes in state and a rudimentary understanding of the water cycle.