According to the passage, why can glass be more easily shaped into specific forms than can metals
Câu hỏi:
According to the passage, why can glass be more easily shaped into specific forms than can metals
A. It resists breaking when heated
B. It has better optical properties
C. It retains heat while its viscosity changes
D. It gradually becomes softer as its temperature rises
Trả lời:
Chọn D
Thông tin: Unlike metals that flow or “freeze” at specific temperatures glass progressively softens as the temperature rises, going through varying stages of malleability until it flows like a thick syrup. Each stage of malleability allows the glass to be manipulated into various forms, by different techniques, and if suddenly cooled the object retains the shape achieved at that point. (Không giống như kim loại chảy hoặc “đông cứng” ở nhiệt độ cụ thể, thủy tinh mềm dần khi nhiệt độ tăng lên, trải qua các giai đoạn dẻo khác nhau cho đến khi chảy giống như xi-rô đặc. Mỗi giai đoạn của tính dẻo cho phép thủy tinh được chế tác thành nhiều dạng khác nhau, bằng các kỹ thuật khác nhau và nếu được làm lạnh đột ngột, vật thể vẫn giữ được hình dạng đạt được tại thời điểm đó.)
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