4. वह पदार्थ जो घर्षण को कम करता है
कहलाता है।
The substance which reduce friction are called
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Explanation:
Lubricant is your answer
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A lubricant is a substance, usually organic, introduced to reduce friction between surfaces in mutual contact, which ultimately reduces the heat generated when the surfaces move.
एक स्नेहक एक पदार्थ है, आमतौर पर कार्बनिक, पारस्परिक संपर्क में सतहों के बीच घर्षण को कम करने के लिए पेश किया जाता है, जो अंततः सतहों के हिलने पर उत्पन्न गर्मी को कम करता है।
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