The frontiers when taken into consideration, maps which establishes the European frontiers were seen to appear from the 18th century only and not prior to that.
<u>Explanation:
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The ideology of formation of state or state boundary were emerged with the period of 17th century and even mid of 16th century witnessed it. The establishment of frontier though started with 18th century only.
The different topographical features were considered to describe the fronts such as the rivers, mountains. And, even the landmarks such as forts or towers were considered as the border distinction.
When this vapor hits cooler air it changes back to its liquid form and creates clouds. When so much of the water vapor has condensed and the clouds are heavy, the liquid falls back down in the form of precipitation.
Explanation:
Wien’s Law:
The law states that the wavelength at which black body emits maximum heat is inversely proportional to the temperature of the body in Kelvins.
1) Walls at 300 K
2) Ice water at 273 K :
3) Hot water at 373 K :
4)Skin at 310 K:
5)An incandescent light bulb at 3000 K
