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water
Table of Contents
References & Edit History Quick Facts & Related Topics
Images & Videos
water rapids, Niagara Falls, Canada
The chemistry of water
polar bear on ice floe diagram of the hydrologic cycle of water Hoover Dam diagram of a water treatment system
water harvesting
water molecule
Which has a lower freezing point, salt water or fresh water?
water droplets
For Students
Lake Mead is seen in the distance behind a dead creosote bush in an area of dry, cracked earth that used to be underwater near where the Lake Mead Marina was once located on June 12, 2021 in the Lake Mead National Recreation Area, Nevada.
Comprehension Quiz: Water Scarcity
water summary
Quizzes
water glass on white background. (drink; clear; clean water; liquid)
Water and its Varying Forms
Metal and enamel pan of boiling water on stove. (boiling point; cooking; steam; cooking gas; non-electric)
Aitch-Two-Oh?
Encyclopaedia Britannica thistle graphic to be used with a Mendel/Consumer quiz in place of a photograph.
27 True-or-False Questions from Britannica’s Most Difficult Science Quizzes
Related Questions
Read Next
Water droplets on flat surface.
Water Explained in 5 Questions
Iceberg, Arctic (polar, environment, global warming)
Why Does Water Freeze from the Top Down?
Waves, North Shore of Oahu, Hawaiian Islands, United States.
Why Is the Ocean Salty?
Drinking water is poured into a glass.
Water Fluoridation: Just the Facts
Saguaro cacti dot the Sonoran Desert landscape at Saguaro National Park, Arizona. Formerly Saguaro National Monument cactus
Can You Drink Water from a Cactus?
Discover
A Factory Interior, watercolor, pen and gray ink, graphite, and white goache on wove paper by unknown artist, c. 1871-91; in the Yale Center for British Art. Industrial Revolution England
Inventors and Inventions of the Industrial Revolution
Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.
10 Famous Artworks by Leonardo da Vinci
Thanksgiving Celebration Traditional Dinner Setting Food Concept
Why Is Thanksgiving in the U.S. Celebrated on a Thursday?
An ancient egyptian hieroglyphic painted carving showing the falcon headed god Horus seated on a throne and holding a golden fly whisk. Before him are the Pharoah Seti and the goddess Isis. Interior wall of the temple to Osiris at Abydos, Egypt.
11 Egyptian Gods and Goddesses
Close up of books. Stack of books, pile of books, literature, reading. Homepage 2010, arts and entertainment, history and society
12 Novels Considered the “Greatest Book Ever Written”
Rural Irish landscape, Sligo, Ireland.
Why Is Ireland Two Countries?
Iraqi Army Soldiers from the 9th Mechanized Division learning to operate and maintain M1A1 Abrams Main Battle Tanks at Besmaya Combat Training Center, Baghdad, Iraq, 2011. Military training. Iraq war. U.S. Army
8 Deadliest Wars of the 21st Century

water: Media

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Videos

The chemistry of water
An overview of the chemical structure of water molecules.
Video: © American Chemical Society (A Britannica Publishing Partner)
water harvesting
Researchers invent a device that can harvest drinkable water from desert air.
Video: Displayed by permission of The Regents of the University of California. All rights reserved. (A Britannica Publishing Partner)
Which has a lower freezing point, salt water or fresh water?
Learn why fresh water and seawater have different freezing points.
Video: Contunico © ZDF Studios GmbH, Mainz; Thumbnail © Tatianatatiana/Dreamstime.com
splitting water
A catalyst that splits water into hydrogen and oxygen.
Video: © American Chemical Society (A Britannica Publishing Partner)
Experiment: Dissolving M&M's candy coating with different liquids
Watch an experiment on dissolving the candy coating on M&M'S.
Video: © American Chemical Society (A Britannica Publishing Partner)
The water cycle: From the ocean to the air
Overview of water moving through the hydrologic cycle, or water cycle: it evaporates...
Video: Encyclopædia Britannica, Inc.
The relationship between photosynthesis and breathing
Learn about the role of photosynthesis in glucose and oxygen production in plants....
Video: Encyclopædia Britannica, Inc.
Learn how the Sun warms moist air near the ground and causes it to rise and condense on dust particles
Dust and other aerosols suspended in the atmosphere provide the surfaces upon which...
Video: Encyclopædia Britannica, Inc.
Understand the process and the factors involved in cloud formation
The process of cloud formation relies on several factors, including the rate of vaporization...
Video: © MinuteEarth (A Britannica Publishing Partner)
How different solutions conduct electricity
Conducting electric current in a solution of electrolytes.
Video: Encyclopædia Britannica, Inc.
The journey of water: From evaporation to precipitation
How does water vapor enter Earth's atmosphere?
Video: Encyclopædia Britannica, Inc.
How to boost energy without caffeine
How to increase alertness without caffeine, and the chemistry of why these methods...
Video: © American Chemical Society (A Britannica Publishing Partner)
Know about the project “MK:Smart”, a smartphone appl to help residents of Milton Keynes manage and use water more efficiently
Learn about a proposed smartphone application to help residents of Milton Keynes,...
Video: © Open University (A Britannica Publishing Partner)
Why is seawater so salty?
An explanation of why seawater is salty.
Video: Contunico © ZDF Studios GmbH, Mainz
Understand sublimation, where a substance changes directly from solid to gas without going through the liquid state of matter
Sublimation is the conversion of a substance from the solid to the gaseous state...
Video: © MinuteEarth (A Britannica Publishing Partner)
The science of surface tension explained
Learn about surface tension and compare the surface tensions of different liquids,...
Video: Encyclopædia Britannica, Inc.

Images

water rapids, Niagara Falls, Canada
Water is the most plentiful compound on Earth and is essential to life. Although...
© SKatzenberger/iStock.com
polar bear on ice floe
Polar bear on an ice floe in the Svalbard archipelago. The sight of ice floating...
© SeppFriedhuber—E+/Getty Images
diagram of the hydrologic cycle of water
In the hydrologic cycle, water is transferred between the land surface, the ocean,...
Encyclopædia Britannica, Inc.
Hoover Dam
The Hoover Dam on the Colorado River at the border of Nevada and Arizona demonstrates...
Robert Glusic/Getty Images
diagram of a water treatment system
Water treatment systems are important for desalinating seawater so it can be used...
Encyclopædia Britannica, Inc.
water molecule
A water molecule is made up of two hydrogen atoms and one oxygen atom. A single oxygen...
Encyclopædia Britannica, Inc.
water droplets
Water is a polar molecule and is attracted to other polar molecules. Thus, droplets,...
© fotofuerst/Fotolia
hydration of a sodium ion
The hydration of a sodium ion.
Encyclopædia Britannica, Inc.
Earth
The predominance of water on Earth is apparent in a photograph taken by the Galileo...
NASA/JPL
boiling
Water at its boiling point.
© Getty Images
wave
A wave in water.
© juland/Fotolia
Dispersal of several types of seeds.
Encyclopædia Britannica, Inc.
Photosynthesis
Diagram of photosynthesis showing how water, light, and carbon dioxide are absorbed...
Encyclopædia Britannica, Inc.
Mars
Global map of Mars in epithermal (intermediate-energy) neutrons created from data...
NASA/JPL/University of Arizona/Los Alamos National Laboratories
water stress projections
World map of projected water stress by country in 2040 under business-as-usual scenarios.
Encyclopædia Britannica, Inc.
pure water and temperature
Figure 1: Relationship between the density of pure water and temperature.
Encyclopædia Britannica, Inc.
absorption coefficient for liquid water
Figure 3: The absorption coefficient for liquid water as a function of frequency.
From J.D. Jackson, Classical Electrodynamics, copyright © 1975 by John Wiley & Sons, Inc.
Encyclopædia Britannica, Inc.
hydrologic cycle
This diagram shows how, in the hydrologic cycle, water is transferred between the...
Encyclopædia Britannica, Inc.
hydrolysis of an ester
Reaction of methyl acetate and water demonstrating the hydrolysis of an ester.
Encyclopædia Britannica, Inc.
mechanisms of enzymatic action
Mechanisms of enzymatic action (see text).
Encyclopædia Britannica, Inc.
molecular orbital energy-level diagrams
Figure 8: Molecular orbital energy-level diagrams for (A) beryllium hydride, BeH2,...
Encyclopædia Britannica, Inc.
ethanol production
Addition reaction of ethylene (C2H4) with water (H2O)...
Encyclopædia Britannica, Inc.
State (liquid, vapour, or both) of a fixed mass of water under varying conditions...
Encyclopædia Britannica, Inc.
cryogenic region
The cryogenic temperature range.
Encyclopædia Britannica, Inc.
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