The expansion in the length of an object is called linear expansion while the expansion in length and breadth, i.e. in the area is called the superficial expansion. The expansion in three dimensions i.e. in length, breadth and thickness of an object is called the cubical expansion. This note provides us an information about the expansions of solids.
When the bimetallic strip is heated, the brass, having a greater value of, expands more than the steel. This note provide us an information on coefficient of linear expansion by Pullinger's apparatus, bimetallic thermostat and differential expansion
This note provides us an information about Determination of real expansivity of liquid (Dulong and Petit's experiments and Determination of Real Expansivity of liquid and Anomalous Expansion of Water . Absolute expansivity of liquid is determined by Dulong and Petit’s experiment . It consists of U-shaped ABCD tube having a uniform diameter. In Fortin’s barometer, the brass scale is calibrated at 0oCand the mercury is adjusted at the same temperature. If the room temperature is greater than 0oC, then both mercury and brass scale expand. As expansion in liquid and solid is different, correction in brass scale and in the density of mercury requires for the correct pressure at any temperature. Hope verified experimentally the anomalous expansion of water.