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Boyle’s Law

Published in Lesson Plans. Tags: boyles law, gas, physics, pressure, selective experiments in physics, volume.

OBJECT: To investigate the relationship between the pressure and the volume of a confined mass of gas at Constant temperature.

METHOD: Amass of dry air is trapped above a column of mercury in a closed tube which forms one arm of a mercury manometer. The pressure upon the confined air can be regulated by means of a plunger which controls the height of the mercury columns, and its value is determined from the difference between the mercury levels in the open and closed arms. The volume of the confined air is measured by the length of the closed tube above the mercury level. From a series of determinations of pressure and volume, curves are plotted showing the relation between pressure and volume. Continue reading ‘Boyle’s Law’

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Boyle’s and Charles’ Laws

Published in Lesson Plans. Tags: boyles law, Charles Law, physics, pressure, selective experiments in physics, temperature.

OBJECT:To study Boyle’s law and Charles’ law, as applied to air at moderate temperatures and pressures.

METHOD: To study Boyle’s law a fixed mass of air confined in a glass tube is kept at room temperature and subjected to various pressures, ranging from half to double atmospheric pressure. A series of corresponding pressures and volumes are observed and Boyle’s law is checked by noting the constancy of their products. The data are plotted in several graphical forms the interpretation of which also indicates the validity of Boyle’s law. Charles’ law for the expansion of gases is studied by the use of a simple form of constant-volume air thermometer. A fixed volume of dry air is subjected to certain measured temperatures and the Corresponding pressures observed. From the resultant pressure-temperature curve the temperature coefficient of pressure increase at constant volume is determined. By extrapolating this curve the value of “absolute zero” is approximately measured.
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Inertia on Your Side

Published in Science at Home and Lesson Plans. Tags: air pressure, dynamics, force, inertia, kinematics, mechanics, Newtons 1st law, Newtons laws, physics, pressure.

Materials

Paint sticks or thin flat boards
A large sheet of butcher paper or newspaper

Procedure

Place a stick on a table so a little less than half of the stick is sticking out over the edge of the table so that it looks like a diving board
Ask the students to predict what will happen if you strike the end of the stick
Make sure none of the students are in the line of fire, then hit the end and the stick will fly off the table

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