Nature · 1
What percentage of the human body is water?
Answer
70%
The human body is approximately 60-70% water by mass, with water content varying by age, sex, and body composition. Water is essential for all biological functions including nutrient transport, temperature regulation, and waste removal, making it Earth's most important biological solvent. Infants are born at approximately 75% water, while elderly people are typically around 50% water due to declining muscle mass and tissue water content.
💡 Did you know?
Infants are 75% water while elderly people are 50%—water decreases with age.
Other options people guess
- 50%
- 60%
- 80%
Topics
- human body
- biology
- chemistry
Know your nature trivia?
Play a free Nature quiz and see how many you get right — no signup needed to start.
More Nature facts
Nature
How many chambers does a fish heart have?
Fish hearts are simpler than mammals' but function efficiently in water.
Nature
How many chromosomes do humans have?
Humans share 98% DNA with chimpanzees; chimpanzees have just two extra chromosomes, revealing our evolutionary closeness at the molecular level.
Nature
What is the pH level that indicates a neutral solution?
Stomach acid has pH 1.5 while seawater is pH 8.1—opposite ends of the scale.
Nature
What is the primary source of energy for nearly all life on Earth?
The Sun's energy drives weather, oceans, and all biological processes on Earth.
Nature
What is the only continent with no active volcanoes?
Australia is the only volcano-free continent, though Antarctica has Mount Erebus beneath ice.
Nature
What is the only mammal besides humans known to engage in warfare?
Jane Goodall's 1970s research revealed chimpanzees wage organized territorial warfare—challenging assumptions about violence being uniquely human.