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A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit.

Diopter, in optics, unit of magnifying power of a lens or lens system.

Indian Institute of Space Science and Technology Valiamala P O, Thiruvananthapuram .

Generally, rainbows will be spotted in the opposite direction of the sun. So if you live in the northern hemisphere and its raining in the afternoon, if a rainbow appears at all it will appear to east.

The lambert is a non-SI unit of luminance named for Johann Heinrich Lambert, a Swiss mathematician, physicist and astronomer. A related unit of luminance, the foot-lambert, is used in the lighting, cinema and flight simulation industries. The SI unit is the candela per square metre.

24 carat = 100%

12 carat = 50%

6 carat = 25%

12+6 = 18 carat = 75%

Using iodine to test for the presence of starch is a common experiment. A solution of iodine (I2) and potassium iodide (KI) in water has a light orange-brown color. If it is added to a sample that contains starch, such as the bread pictured above, the color changes to a deep blue.

The climatic snow line is the point above which snow and ice cover the ground throughout the year. The actual snow line may adjust seasonally, and be either significantly higher in elevation, or lower. The interplay of altitude and latitude affects the precise placement of the snow line at a particular location.

Nickel Steel: It contains 2% nickel. It is hard, resistant to corrosion and elastic. It has higher tensile strength than iron. It is used for making bicycle parts, automobile parts and aeroplane parts. If the percentage of nickel is 36, then the alloy is used for making scientific instruments. If the alloy contains 46% nickel, it is used in making radio valves.

(1) Sustainable development is development that meets the needs of the present without compromising the ability of future generations to meet their own needs.
(2) The four main types of sustainability are human, social, eco- nomic and environmental .
(3) This means we cannot continue using current levels of resources as this will not leave enough for future generations.

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