photometer

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$Light refraction image with a cube. Prism$

How Is Light Both a Particle and a Wave?

Discover

Apollo 12 astronaut Charles "Pete" Conrad stands beside the U.S. flag after is was unfurled on the lunar surface during the first extravehicular activity (EVA-1) Nov. 19, 1969. Footprints made by the crew can be seen in the photograph.

How Many People Have Been to the Moon?

King Cobra snake in Malaysia. (reptile)

9 of the World’s Deadliest Snakes

World Data Locator Map: Australia

Is Australia an Island?

Demystified - Do Lemmings Really Commit Mass Suicide? illustration

Do Lemmings Really Commit Mass Suicide?

Orange basketball on black background and with low key lighting. Homepage 2010, arts and entertainment, history and society

The 10 Greatest Basketball Players of All Time

Ahura Mazda - relief of the Zoroastrian god Ahura Mazda at the ancient ruins of Persepolis in Iran. Also known as Ormazd Zoroastrianism,

Which Religion Is the Oldest?

International currencies, money, various banknotes, currency

A Brief (and Fascinating) History of Money

photometer: Related Content

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Topics

exposure meter hydrophotometer submarine photometer actinometer photovoltaic exposure meter photoconductive exposure meter luminous intensity machine measurement optical interferometer Secchi disk radiation measurement particle accelerator psychological testing measurement system productivity clock robot lubrication

Key People

Robert Bunsen

Robert Bunsen

German chemist

Quiz

barometer. Antique Barometer with readout. Technology measurement, mathematics, measure atmospheric pressure

Fun Facts of Measurement & Math