Silk is said to have stronger tensile strength than which metal?

Question

BlackTom AI · Accepted Answer

Tensile strength measures the maximum stress (force per unit area) a material can withstand when stretched before breaking. Silk—especially spider silk—exhibits exceptionally high tensile strength and a very favorable strength-to-weight ratio, which is why it is often compared directly with steel.

Step-by-step reasoning and numerical comparison:
1. Typical tensile strengths:
   - Spider silk: reported values range up to about 1.0–1.3 GPa (1000–1300 MPa) for some species; Bombyx mori (silk moth) silk ≈ 400–600 MPa in many measurements.
   - Common structural steel (mild/low-alloy): roughly 400–550 MPa tensile strength; some high-strength alloy steels can exceed 1000 MPa, but those are specialized.
2. Compare representative numbers: take spider silk ≈ 1000 MPa and mild steel ≈ 500 MPa.
   - Ratio = 1000 MPa / 500 MPa = 2.0, so spider silk can be about twice as strong by tensile strength per unit area in this comparison.
3. Interpretation: because silk fibers can reach tensile strengths comparable to or exceeding common steels, the common statement is that “silk is stronger than steel.”

Why the correct answer is Steel:
- The conventional, widely cited comparison contrasts silk with steel to emphasize silk’s remarkable strength-to-weight performance. Using the representative values above shows silk can exceed steel in tensile strength.

Why the other options are incorrect:
- Iron: pure iron has tensile strength lower than many steels, but the standard popular comparison uses “steel,” not iron.
- Aluminum: typical aluminum alloys have much lower tensile strength (tens to a few hundred MPa) than silk.
- Lead: very low tensile strength (single-digit to low tens of MPa); far weaker than silk.

Conclusion: Given tensile strength data and the common comparison, silk is said to have stronger tensile strength than steel, which matches the provided answer: Steel.

Silk is said to have stronger tensile strength than which metal?单项选择题

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