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সোনার প্রসারনশীলতা বেশি। কারণ একই পরিমাণ সোনা ও লোহা থেকে বেশি সরু ও বেশি লম্বা তার তৈরি করা যায় সোনার ক্ষেত্রে।
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সোনার প্রসারনশীলতা বেশি। কারণ একই পরিমাণ সোনা ও লোহা থেকে বেশি সরু ও বেশি লম্বা তার তৈরি করা যায় সোনার ক্ষেত্রে।