CHE 102 Lecture Notes - Lecture 2: Sodium Bicarbonate, Brown Sugar
Document Summary
The activity and the subject of science is concerned with the rational explanation of the physical world. Technology makes use of that knowledge to serve some purpose. Torricelli was the first to investigate this this problem scientifically. His model was simple but difficult to construct in the 17th century: an ~35 ft closed end glass tube. Fill the tube with water and cork it. Invert the tube in a large basin of water and uncork it. The nature of this unknown void in the upper 1 ft. of the tube was a source of considerable scientific controversy. Importantly, the height of the liquid in the column doesn"t depend on the diameter of the column, i. e the area of the opening. The bigger the column, the greater the force to which the contained liquid is exposed. Pressure is defined as the force (weight is a force) over a given area; for example, atmospheric pressure is ~14. 7 pounds per square inch; .
