#  Mechanical Properties 

 



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### Creep of Lead 

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Lead rod subjected to tensile load.  
  
\[[In-Depth Description](/presentations/creep-lead)\]

### The Surface Treatment of Glass

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Comparison of breaking strength of microscope slides before and after treatment with acid.  
  
\[[In-Depth Description](/presentations/surface-treatment-glass)\]

### Fracture Strength of Chalk

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Chalk rod subjected to tensile and compressive loads.   
  
\[[In-Depth Description](/presentations/fracture-strength-chalk)\]

### Balogna Bottle and Rupert's Drops

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Stressed glass shatters catastrophically with a little help.

### Young's Modulus

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Stretching of long wire with load.

### Work Hardening and Annealing

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Annealed brass rod is hardened by bending.

### Strength of Copper Wire

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Annealed and drawn copper wire are compared.

### Everyday objects at low temperature 

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Change of properties of objects after immersion in liquid nitrogen.  
  
\[[In-Depth Description](/presentations/everyday-objects-low-temperature)\]

### Chinese "Faith" Bell

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Unlike the lead bell which rings when cold, this copper alloy bell exhibits the opposite effect of temperature on vibrational damping.

### Rubber Elasticity

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Unlike most other materials. rubber contracts when heated.

### Contact Us

**Mailing Address**: Lecture Demonstration Services, Science Center, Rm B-08A, 1 Oxford Street, Cambridge, MA 02138  
**Campus Location**: Science Center B-08A | **Tel**: (617) 495-5824 | **Email**: scidemos-at-fas.harvard.edu