← Back

January 11, 2010

#687: Dimensional Analysis

Dimensional Analysis

[[On a blackboard.]]

(Plank energy

Pressure at the Earth’s core) x (Prius combined EPA gas mileage

Minimum width of the English Channel) = pi

[[A teacher indicates this equation with a pointer in front of a class.]]

Teacher: It’s correct to within experimental error, and the units check out. It must be a fundamental law.

Student: But what if they build a better Prius?

Teacher (italic): Then England will drift out to sea.