Law of Partial Pressure











Image Source (Dalton’s Law)

Image Source (John Dalton)

1.  Another key pioneer in understanding air pressure (and the pressure of gases in general) was John Dalton (1766 – 1844)

  • He is considered by many to be the Father of Atomic Theory as he demonstrated that the atomic weights of elements are proportionate to one another 1

2.  In 1787, Dalton became interested in meteorology

  • He began to make daily observations regarding the weather – eventually this list grew to contain over 200,000 entries 2

3.  In 1803 Dalton published his law of partial pressures known as Dalton’s Law:

  • “When different gases combine, the resulting pressure will be the sum of what each gas gives individually” 3

4.  John Dalton was a Bible believing Christian 4


Image Source:

5.  Air Pressure is really a combination of the individual pressures of those gaseous elements of which it is comprised

  • Dalton’s Law of Partial Pressures was first devised in 1803 5