The Pressure of Light (1958) is an educational science film featuring Professor Jerrold R. Zacharias of the Massachusetts Institute of Technology. Produced by Encyclopaedia Britannica Films, the film demonstrates the concept of light exerting pressure, a phenomenon predicted by Maxwell's equations and confirmed by experiments. Zacharias employs various demonstrations, including the use of a radiometer pinwheel and a suspended thin foil in a high vacuum, to illustrate how light can impart momentum to objects. The film also addresses common misconceptions, clarifying that the rotation of a Crookes radiometer is due to thermal effects rather than light pressure. This film was part of the Physical Science Study Committee (PSSC) initiative aimed at reforming physics education in the United States.