Lots of good things here:

http://www.engineeringtoolbox.com/

Right at the top of the page:
Metals - Melting Temperatures

Melting temperature of some common metals and alloys

Cooling Loads - Latent and Sensible Heat

Latent and sensible cooling loads to consider in design of HVAC systems

Ammonia - NH3 - Concentration in Air and Health Symptoms

Ammonia and health symptoms - smell and threat to life

Stress, Strain and Young's Modulus

Stress is force per area - strain is deformation of a solid due to stress

Coefficients of Linear Thermal Expansion

Linear temperature expansion coefficients for some common materials as aluminum, copper, glass, iron and many more
Enjoy!