Thermometer Mercury or alcohol-filled glass tube, used to measure temperature Main principle: Liquids will change volume depending on its temperature

Manometer: a device for measuring pressure

Thermometers, Manometers, and Sphygmomanometers

Manometer A simple manometer is a glass U tube filled with liquid Pressure corresponds to fluid density and height and gravity

Everyday manometer

Water Manometer What can you say about the liquid in the tube?

Glass Manometer with Liquid One end is open to the atmosphere and one is closed. Point A is at atmospheric pressure Point C is the pressure of the gas at the closed end of the tube Connected to gas source

Glass Manometer Connected to gas source Point B has a pressure greater than atmospheric due to the weight above it (height h) The pressure at point B is equal to the pressure at point ___________ Then…what can you say about the pressure exerted by the gas source??

Glass Manometer Connected to gas source The pressure exerted by the gas source at the trapped end of the tube is more than atmospheric pressure by the amount h

What’s Going On? Connected to gas source What can you conclude about the pressure at Point C?

Newton’s Third Law: Law of Conservation of Energy Energy may not be created nor destroyed The sum total of all the energies in a system (potential, kinetic, heat, light) is a constant

Example of Conservation of Energy: Pendulum

The sum of all energy in a system is constant Potential energy= m X g X h M = mass g = force of gravity h = height Kinetic energy = energy of motion position of blue ball- Potential energyPosition of purple ball-______energy

PE + KE = 0 What makes the pendulum stop?

Bernoulli’s Equation What can you say about the flow of water through this tube? P1

Bernoulli’s Equation P1P1 Energy per unit volume before= energy per unit volume after

Bernoulli’s Equation: For fluids with a constant density, steady flow, and no friction

A Closer View of Bernoulli’s equation

How does Bernoulli’s equation relate to blood vessels?

Cross-sectional area vs velocity When blood vessel diameter decreases, velocity increases; arterial diameter is less than that of veins

Bibliography: “Animated Demonstration of Bernoulli’s Principle, “Bernoulli’s Equation,” 10 July 2009 < Equation,” 10 July 2009 “Bernoulli Equation,” The Engineering Toolbox, 14 July 2009 “Bernoulli’s Equation,” “Build your Own Manometer,” The Science House-Flight, 15 July “Cardiovascular Physiology Concepts, “ 15 July 2009 “The Law of Conservation of Energy,” 15 July Loeschnig, Louis and Jack Gallagher, Chemistry Experiments, Sterling Publishing Company,I nc.,NY, 2005 ‘Manometers,” July “Manometer or How Fast are we Going?,”August, 2006 < or How Fast are we Going?,”August, 2006 “Pressure, “ 28 February,