The process of providing adequate water to the body or a chemical reaction involving water molecules. Essential for maintaining bodily functions and cellular processes.
From Greek hydor 'water' + -ation suffix. The chemical sense emerged in 19th century chemistry, while the biological meaning developed with advancing understanding of human physiology.
Your body is constantly performing a water-balancing act - you lose about 2.5 liters of water daily through breathing, sweating, and waste elimination, and even a 2% decrease in hydration can impair cognitive performance and mood before you even feel thirsty.
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