how many litres of water is in the human body?
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In Netter's Atlas of Human Physiology, body water is broken down into the following compartments: Intracellular fluid (2/3 of body water) is fluid contained within cells. In a 72-kg body containing 40 litres of fluid, about 25 litres is intracellular, which amounts to 62.5%.
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In terms of daily use, a single person household used an estimated 149 liters per day, with water usage amounting to 276 liters per day when two people lived at home. There are many household appliances that use water, such as dishwashers, washing machines or toilets, and each uses varying amounts.
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Intracellular fluid (2/3 of body water) is fluid contained within cells. In a 72-kg body containing 40 litres of fluid, about 25 litres is intracellular, which amounts to 62.5%.
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By weight, the average human adult male is approximately 60-63% water, and the average adult female is approximately 52-55% water. There can be considerable variation in body water percentage based on a number of factors like age, health, water intake, weight, and sex.
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"Through daily activities, our bodies can lose up to three to four liters a day just by perspiration, urine, bowel movement, and exhalation of air," says Lee. She shares a surprising factoid that we lose one to two liters alone from just breathing.
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According to current estimates, each person consumes approximately 150 litres per day — equating to almost two full bathtubs of water per person per day, or 54,750 litres per person each year. Most of this water is flushed away every day.
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You get about 20% of your water every day through food so a general rule is to drink 2 litres of water a day. This is the equivalent to a large bottle of fizzy drink or three-and-a-half pints.
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The kidneys of a healthy adult can flush out 20 to 28 L of water each day, but they can only get rid of about 1 L each hour. This makes it hard for your kidneys to keep up when you drink more than 1 L per hour.
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That's why it's important to drink enough fluids. In climates such as the UK's, we should drink about 1.2 litres (six to eight glasses) of fluid every day to stop us getting dehydrated. In hotter climates, the body needs more than this.
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According to Moskowitz, it depends on each individual, but anything more than half your body weight could be the limit. “Symptomatic water intoxication, or hyponatremia, begins when someone drinks about three to four liters of water at one time,” explains Valdez.
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The number of molecules is therefore 6.022*1023 * 55.556 = 3.346*1025 molecules. The number of atoms is 3 times larger because each molecule has three atoms, so there are 1.0038*1026 atoms in a liter of water. Now we know enough to answer your question. A typical human head weighs about 10 - 12 pounds.
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According to the World Health Organization (WHO), between 50 and 100 litres of water per person per day are needed to ensure that most basic needs are met and few health concerns arise.
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Up to 60% of the human adult body is water. According to H.H. Mitchell, Journal of Biological Chemistry 158, the brain and heart are composed of 73% water, and the lungs are about 83% water.
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NHS Choices' page on Water and drinks says: Your body needs water or other fluids to work properly and to avoid dehydration. That's why it's important to drink enough fluids. In climates such as the UK's, we should drink about 1.2 litres (six to eight glasses) of fluid every day to stop us getting dehydrated.
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Water is an essential nutrient for life (1). Institute of Medicine (IOM) recommendations from 2004 set adequate levels for total water intake from all foods and liquids at 3.7 liters (125 ounces) for men and 2.7 liters (91 ounces) for women (2).
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The answer is the number of litres you should be drinking per day. So, if you weigh 60 kilos for example, you should drink 2 litres of water a day, whereas if you weigh 80 kilos, you should drink 2.6 litres (2 litres and 600 ml) of water per day.
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For women, the amount of total water is about 11.5 cups per day and for men about 15.5 cups. These estimates, however, include fluids consumed from both foods and beverages, including water. You typically get about 20% of the water you need from the food you eat.