Density Gallery

Density is a measure of how much mass an object has in a given volume, and is calculated by dividing the mass of an object by its volume

MAP microwave background
Cosmic microwave background. Whole sky image of the cosmic microwave background made by the MAP (Microwave Anisotropy Probe) spacecraft

UK at night from space
UK at night, as seen from the International Space Station (ISS). City lights (yellow) show areas of dense population. France is at bottom. Image taken on 24th December 2010

Europe at night, satellite image. City lights (yellow) show areas of dense population. There are few lights in North Africa (bottom) and the Arctic (top) since they are more sparsely populated

North America at night, satellite image
Africa at night. Satellite image of the Earth at night, set against a background of stars, centred on the continent of Africa. North is at top. City lights (yellow) show areas of dense population

South America at night, satellite image. City lights (yellow) show areas of dense population, particularly in North America (top left) and South Americas coasts

Americas, South America, Ecuador, Quito. At over 9, 000 feet in elevation, the capitol of Ecuador
Ecuador, Quito. At over 9, 000 feet in elevation Quito sits in a valley surrounded by the Andes mountains, providing countless scenic vistas. Quito was the first established UNESCO World Heritage site

Southeast Asia at night, satellite image
Southeast Asia at night. Satellite image of the Earth seen at 18:00 (6pm) GMT (UCT), centred on China. City lights (yellow) show areas of dense population, particularly in India (left)

Italy at night, ISS image
Italy at night. International Space Station (ISS) image of Italy (centre) and the Adriatic coast (right) at night. The island of Sicily is at centre left

Africa, night-day satellite image. This composite image of the Earth is set against a background of stars, and is centred on the continent of Africa. North is at top

Whole Earth at night, satellite image. This map is centred on the Greenwich meridian, at zero degrees latitude. City lights (yellow) show areas of dense population

Equal volumes of different materials. From left to right are blocks of brass, balsa wood and polystyrene. Although they are the same size

Australia at night, satellite image. City lights (yellow) show areas of more dense population, particularly in Southeast Asia (top left) and on Australias east coast

Hydrometers and Hygrometers C017 / 3433
Plate from 18th century encyclopedia showing illustrations of hydrometers and hygrometers. A hydrometer is an instrument used to measure the specific gravity (or relative density)

Oil and water, high-speed image
Oil and water. High-speed photograph of oil being poured onto water. Since oil and water are immiscible liquids (they cannot be mixed)

A woman carrying an umbrella is silhouetted from behind a window covered with rain drops during wet weather in Colombo April 29, 2014

View of Lucca from Torre Guinigi, Lucca, Tuscany, Italy, Europe Date: 10/02/2006

View of Florence, Italy from Piazza Michelangelo. Date: 11/11/2005

Panoramic view of Florence, Italy along the Arno River and Ponte Vecchio (Old Bridge). Date: 11/11/2005

Elevated view of city, Udaipur, India Date: 11/11/2005

Air pollution, New Delhi, India Date: 11/11/2005

General view of the residential area is pictured during dusk at Jodhpur in Rajasthan
A general view of the residential area is pictured during dusk at Jodhpur in Rajasthan, April 5, 2015. Jodhpur, also known as the blue city in the desert Indian state of Rajasthan

View of the old quarter of Sanaa
A view of the old quarter of Sanaa, Yemen August 6, 2018. Picture taken August 6, 2018. REUTERS/Khaled Abdullah

Migrating starlings fly in formation across the sky near the southern Israeli town of Rahat February 2, 2015. The phenomenon known murmuration is most common during the winter months

Office and residential buildings are silhouetted in the dusk from the observation deck of Tokyo Skytree, the worlds tallest broadcasting tower, in Tokyo, Japan June 18, 2019. REUTERS/Issei Kato

Thousands of starlings fly over marshes as they return to roost at dusk near Glastonbury in Somerset, south west England, January 14, 2015

Office and residential buildings are seen from the observation deck of Tokyo Skytree in
Office and residential buildings are seen from the observation deck of Tokyo Skytree, the worlds tallest broadcasting tower, in Tokyo, Japan June 18, 2019. REUTERS/Issei Kato

Moonrise behind the downtown Seattle skyline, Seattle, WA

The Manhattan Bridge and Manhattan skyline in the evening light from Brooklyn Bridge Park
Manhattan Bridge and Manhattan skyline in the evening light from Brooklyn Bridge Park, New York City, New York

Elevated view of Udaipur, India at sunrise
Elevated view of city, Udaipur, India

Elevated view of Udaipur, India

Jodhpur or the Blue City viewed from Mehrangarh Fort, Jodhpur, India
Blue City viewed from Mehrangarh Fort / Jodhpur, India

Grassy plants and a log in a field in summer, Lower Yukon River, Mountain Village, Alaska, USA
Close-up of wild, green grassy plants in a field with an old fallen tree log in the middle in Summer, Lower Yukon River; Mountain Village, Western Alaska, Alaska, United States of America

Parco del Lavino, Pescara
A heart in the water of Parco del Lavino protected nature reserve. The water is sulfurous and glows a lovely pale blue

British Isles, Comparative valuation of lands according to rental, 1904, Comparative density of population
3648579 British Isles, Comparative valuation of lands according to rental, 1904, Comparative density of population, 1901 (colour litho) by English School

X Ray of a fish c.1890
3501927 X Ray of a fish c.1890 by German School, (19th century); Private Collection; Prismatic Pictures; German, out of copyright

Graph showing foreign-born population in the USA in 1920 (litho)
PNP256604 Graph showing foreign-born population in the USA in 1920 (litho) by American School, (20th century); Private Collection; Peter Newark American Pictures; American, out of copyright

An early X-ray photo of frogs by Joseph Maria Eder. 1896 (photogravure)
746718 An early X-ray photo of frogs by Joseph Maria Eder. 1896 (photogravure) by Austrian School, (19th century); Private Collection; (add.info)

Density of population, 1906, Western hemisphere, Eastern hemisphere, United States, India, Europe (colour litho)
3648577 Density of population, 1906, Western hemisphere, Eastern hemisphere, United States, India, Europe (colour litho) by English School

Some Curiosities of the British Population (engraving)
2773407 Some Curiosities of the British Population (engraving) by English School, (19th century); Private Collection; (add.info.: Some Curiosities of the British Population)

Central and Southern Europe, commercial (colour litho)
3630826 Central and Southern Europe, commercial (colour litho) by English School, (20th century); Private Collection; (add.info.: Central and Southern Europe, commercial)

X Ray of a childs hand c.1890
3501926 X Ray of a childs hand c.1890 by German School, (19th century); Private Collection; Prismatic Pictures; German, out of copyright

Density of population, Central Scotland (colour litho)
3648423 Density of population, Central Scotland (colour litho) by English School, (20th century); Private Collection; (add.info.: Density of population, Central Scotland)

X Ray of an ankle c.1890
3501925 X Ray of an ankle c.1890 by German School, (19th century); Private Collection; Prismatic Pictures; German, out of copyright

X Ray of a fractured wrist c.1890
3501929 X Ray of a fractured wrist c.1890 by German School, (19th century); Private Collection; Prismatic Pictures; German, out of copyright

X Ray of a human torso c.1890
3501928 X Ray of a human torso c.1890 by German School, (19th century); Private Collection; Prismatic Pictures; German, out of copyright

Map of Europe, showing density of population (colour litho)
2813120 Map of Europe, showing density of population (colour litho) by English School, (19th century); Private Collection; (add.info.: Map of Europe, showing density of population)

Density of population, London District (colour litho)
3648422 Density of population, London District (colour litho) by English School, (20th century); Private Collection; (add.info.: Density of population, London District)

Comparative density of population throughout the British Isles, 1901 (colour litho)
3648421 Comparative density of population throughout the British Isles, 1901 (colour litho) by English School, (20th century); Private Collection; (add.info)

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Density is a measure of how much mass an object has in a given volume, and is calculated by dividing the mass of an object by its volume, and are be used to compare the relative densities of different materials, as well as to determine whether a material will sink or float in water, and is important for understanding how substances interact with each other and how they behave under different conditions. For example, air has a lower density than water, so it rises above it when heated and falls below it when cooled. Similarly, objects that are more dense than water will sink while those that are less dense will float. Understanding density helps us understand why certain materials behave the way they do and can be useful for many applications such as engineering and construction projects.