Answer
A real world example of Dalton's atomic theory is that people who ascend to high altitudes experience Dalton's law when they try to breathe. As they climb higher, oxygen's partial pressure decreases as total atmospheric pressure decreases in accordance with Dalton's law. Oxygen has a difficult time making it into the bloodstream when the gas's partial pressure decreases.
Step-by-step explanation
Dalton's atomic theory was the first complete attempt to describe all matter in terms of atoms and their properties. The first part of Dalton's theory states that "all matter is made of atoms, which are indivisible." The second part of the theory says "all atoms of a given element are identical in mass and properties."
A real world example of Dalton's atomic theory is that people who ascend to high altitudes experience Dalton's law when they try to breathe. As they climb higher, oxygen's partial pressure decreases as total atmospheric pressure decreases in accordance with Dalton's law. Oxygen has a difficult time making it into the bloodstream when the gas's partial pressure decreases.