Explanation

Robert Brown discovered the nucleus in plant cells.

It was first described by Franz Bauer in 1804 and in more detail in 1831 by Scottish botanist Robert Brown.

Explanation

Explanation

Explanation

Samuel Colt patented the revolver in 1836.

He revolutionizing firearms with its rotating cylinder.

Explanation

An anemometer is an instrument that measures wind speed.

This type of anemometer has a spinning wheel.

Additional Information:

A hygrometer is an instrument used to measure humidity

A salinometer is used to measure the salinity

A bolometer is used to measure the power of incident electromagnetic radiation

A barometer is used to measure air pressure in certain environment.

Explanation

French physicists Charles Fabry and Henri Buisson discovered the ozone layer in 1913.

They used an interferometer to measure the amount of ozone in the atmosphere.

Explanation

Joseph Priestly discovered oxygen on August 1, 1774.

The most abundant element in the Earth's crust is oxygen.

It making up 46.6% of Earth's mass.

Explanation

Alfred Nobel  Born: October 21, 1833, Stockholm, Sweden

Alfred Nobel  Died: on December 10, 1896, in Sanremo, Italy

Alfred Nobel Full name: Alfred Bernhard Nobel

Alfred Nobel invented dynamite and Nitro-glycerine in 1875.

Alfred Nobel was a chemist from Sweden. 

He is best known for having bequeathed his fortune to establish the Nobel Prize

Alfred Adler proposed  that humans are motivated by Social urges of superiority and inferiority

Explanation

Ernest Rutherford, a British physicist probed atoms with alpha particles.

He was known as the “father of nuclear physics”.

He was awarded the Nobel prize for his contribution to the structure of the atom in 1908.

Explanation

• Humidity in the air was measured by a Hygrometer.
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• A hygrometer is an instrument used to measure relative humidity.
• Humidity is the measure of the amount of moisture in the air.
• A psychrometer is an example of a hygrometer.
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• The humidity in the air tells us about the ratio of Water vapors in the air