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The Days Have Been Getting Shorter Since June. So Why Does The Weather Keep Getting Warmer?

It’s been a little over five weeks since the summer solstice, the longest day of the year. Since June 21, the days have grown progressively shorter. The sun has been in retreat, casting off a little less light every day, beaming down a little less heat. And yet, in many parts of the United States, the weather has only gotten warmer. Scientists have a name for this phenomenon: seasonal lag. In many places, the hottest day of the year comes weeks, or even months, after the longest day of the year. The reason for that has a lot to do with how water soaks up heat.

Chemistry In Pictures Water Photo Contest Winners

The ACS Fall 2019 National Meeting & Exposition in San Diego will explore all things water. To celebrate, Chemistry in Pictures held a water-themed contest in partnership with the ACS Committee on Environmental Improvement throughout the month of June. We looked for high-quality entries with a splash of creativity that help demonstrate scientific concepts. The winners featured here will receive a reusable water bottle and a cash prize. Look for these photos on display at ACS San Diego.