Explanation

In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked on the tube.

Water freeze at 32 F and boils at 212 F

Explanation

Jabir Ibn Hayyan, commonly known as the 'Father of Arab Chemistry',

He was born in Persia, which is now known as Iran, in 721 AD

Notable ideas:

• Use of organic substances in chemistry
• Sulfur-mercury theory of metals
• Science of the balance
• Science of artificial generation

Explanation

The ozone layer lies in the stratosphere, approximately 15-40 kilometers (10-25 miles) above the Earth's surface.

The stratospheric ozone layer is Earth's “sunscreen”  protecting living things from too much ultraviolet radiation from the sun.

Oxygen layer in the atmosphere 

Ozone protects us from the harmful ultraviolet radiation of the sun.

Ozone formula: O3

The ozone layer is depleting: Air pollution

ND17-7-2023

Explanation

Rubies are scientifically known as corundum, a rock-forming mineral and crystalline form of aluminium oxide which is two aluminium atoms and three oxygen atoms (Al2O3) in a close packed hexagonal structure.

Corundum typically contains traces of iron, titanium, vanadium and/or chromium.

Explanation

Objects that are said to be undergoing free fall, are not encountering a significant force of air resistance; they are falling under the sole influence of gravity.

Under such conditions, all objects will fall with the same rate of acceleration, regardless of their mass.

Explanation

Sir Isaac Newton was an English mathematician, physicist, astronomer, alchemist, theologian,

Author widely recognised as one of the greatest mathematicians

And physicists of all time and among the most influential scientists. 

Explanation

The minimum velocity required to place or maintain a satellite in a given orbit is called orbital velocity.

Explanation

Mosquito causes Malaria which affects Spleen.

Malaria is caused by Plasmodium parasites.

Spleen means تلی

Explanation

Explanation

Cosmology as the branch of science is related to the study of Formation of Universe.

Cosmology is the study of the origin, development, structure, history, and future of the entire universe.

Edwin Powell Hubble is known as the father of Cosmology.

Edwin Powell Hubble was an astronomer from America. 

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