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Points to remember:
* A set of physical quantities which cannot be expressed in terms of any other quantities are known as “Fundamental quantities”. Their corresponding units are called “Fundamental units”.
* The physical quantities which can be obtained by mathematically combining (i.e., multiplying and dividing) the fundamental quantities are known as “Derived quantities”. Their corresponding units are called “Derived units”.
* The area of a figure is the region covered by the boundary of the figure. Its SI unit is square metre or m2.
* The area of irregularly shaped figures can be calculated with the help of a graph sheet.
* The amount of space occupied by a three dimensional object is known as its volume. The SI unit of volume is cubic metre or m3.
* The volume of liquids are expressed in terms of litre. One litre = 1000 cc.
* The maximum volume of a liquid that a container can bold is known as the capacity of the container.
* Density of a substance is defined as the mass of the substance contained in unit volume (1 m3).
* SI unit of density is kg/m3. The CGS unit of density is g/cm3. 1g/cm3 = 103 kg/m3.
* The materials with higher density are called “denser” and the materials with lower density are called “rarer”.
* If the density of a solid is higher than that of a liquid, it sinks in that liquid. If the density of a solid is lower than that of a liquid, it floats in that liquid.
* Density = Mass / Volume
* Mass = Density × Volume
* Volume = Mass / Density
* One astronomical unit is defined as the average distance between the earth and the sun. 1 AU = 149.6 × 106 km = 1.496 × 1011 m.
* One light year is defined as the distance travelled by light in vacuum during the period of one year. 1 Light year = 9.46 × 1015 m.
Let’s know about the effects ofmass and volume on density.
Step 1: Use the URL or scan the QR code to open the activity page.
Step 2: Select the options at top right side window to customize
Step 3: Move the sliders on the top left-side window to change the Material and Mass, Volume. Now see the effects of mass and volume on density.
Step 4: Click ‘Reset all’ button to refresh
https://phet.colorado.edu/en/simulation/density (or) scan the QR Code
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