Did you know that your lungs are the only organs in your body that can actually float on water?
If you were to take healthy lungs and place them in water, they would float just like balloons because lungs contain about 300 million tiny air sacs called ‘alveoli’ that are filled with air, making them less dense than water.
However, if lungs are diseased - say with pneumonia or pulmonary edema - the alveoli fill with fluid, and the lungs would sink to the bottom. That’s why forensic scientists sometimes use the ‘lung float test’ to determine if a person’s lungs were healthy before death.
Fun fact: your left lung is actually 10% smaller than your right lung to make room for your heart! We breathe about 23,000 times per day, but our lungs maintain their ‘buoyancy’ throughout.
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