Tag Archives: Science

Who invented the First Hot Air Balloon ?

Montgolfier Brothers

    • The hot air balloon is the oldest successful human-carrying flight technology.
    • French brothers Joseph-Michel Montgolfier (1740 – 1810) and Jacques-Étienne Montgolfier (1745 – 1799) built the first hot air balloon out of cloth and paper.
    • They discovered that a fabric bag filled with hot air would rise.
    • Modern hot air balloon lifted off in 1783 with a demonstration in front of King Louis XVI, Marie Antoinette, and a crowd of 130000 in Annonay, France.

Hot air balloon over yellow flower fields against blue sky

Montgolfier Brothers

First Hot Air Ballon

Original Caption: Paris: Illustration of man's first free ascent from Earth on November 21, 1783. Pilatre de Rozier and Marquis D'Arlandes wave from gallery of their Montgolfier as they set out from Paris.    Montgolfier Model

Hot Air Balloon by Montgolfier Brothers

Hot Air Balloon Anatomy

Hot Air Ballon Timeline

Who invented the Refrigerator ?

William Cullen 

  • It was in 18th century that the process of invention of refrigerator started. In 1748 William Cullen (1710-1790) was a Scottish physician, chemist and professor of University of Glasgow who developed a process for creating an artificial cooling medium. No one took interest in it for commercial or home consumption, it only attracted scientific attention.
  • An American inventor Oliver Evans (1755-1819) made the first design for the refrigerator in 1804 but until 1834 none was interested in the same. Jacob Perkins built the first refrigeration machine in 1834.


William Cullen 1710-1790          Oliver Evans 1755-1819

Refrigerator History

Ice SafesFirst Refrigerator

Fridge change over years

What is the Most Prestigious Award in the World ?

Nobel Prize

  • Since 1901, the Nobel Prize has been honoring men and women from all corners of the globe for outstanding achievements in six areas (chemistry, economic science, literature, medicine, peace, and physics).
  • Alfred B. Nobel (1833–1896), the Swedish chemist and engineer who invented dynamite, left $9 million in his will to establish the Nobel Prizes in 1895.

Nobel Prize

Alfred Nobel Timeline


Alfred Nobel Award

Nobel Peace Prize Winners

How Much Does a Cloud Weigh ?

1.1 million pounds

Cloud weights 1.1 million pounds

How to measure the weight of a cloud

  • How dense the cloud is = 1/2 gram per cubic meter
  • How big the cloud is = a kilometer long and a kilometer tall.
  • Do the math with the density and volume to determine the total water content of the cloud. In this case, it’s 500,000,000 grams of water, or 1.1 million pounds. Volume= Mass / Density
  • How does a several-hundred-ton cloud stay afloat ? It’s distributed among trillions of tiny water droplets spread out over a really big space. Some of these droplets are so small that you would need a million of them to make one raindrop, and gravity’s effect on them is pretty negligible.