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The term sr is a specialized scientific symbol with two distinct meanings depending on its capitalization and context. In physics and mathematics, lowercase sr represents the steradian, which is the standard international unit for measuring solid angles. In chemistry, Sr serves as the symbol for strontium, a soft metallic element that turns yellow when exposed to air and is commonly found in minerals like celestite. This lesson explores the precise definitions of sr, its role in the SI system, and its application in chemical formulas. You will learn how to distinguish between these two technical uses through clear examples and capitalization rules. Watch this video to master the scientific usage of sr.
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