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Chemistry Facts

Why Does Cement Set?

Concrete has been known for literally thousands of years. It is a testament to the enduring strength of this material that concrete structures from those long-ago times are still standing strong ... Continue reading

Image of microstucture predicted from a NIST-developed model of cement hydration.

The Melting Point

Physical properties of a material fall into two categories: intrinsic properties determined by the structure of the particular molecule, and bulk properties characteristic of quantities of molecules ... Continue reading

Warmer Hands (And Toes) Through Chemistry

A popular item for skiers and snowboarders, hunters and people who have to work outside in cold areas, and found in many outdoors shops, are disposable hand warmers. If you haven't used them before, ... Continue reading

What Are Isotopes?

Many of the known elements from which our universe is constructed exist in various isotopic forms. The identity of any particular element is defined by the number of protons within the nuclei of its ... Continue reading