The Kilogram
This Catalyst article looks at the changing definition of the kilogram, a unit of mass and a base unit in the SI system (the International System of units). It has been found that the International Prototype Kilogram (IPK), made in 1879 and kept in a vault in Paris, has lost about 50microgrammes of mass over the years. This may…
Catalysts
A Catalyst article about how catalysts affect the rate of reactions and why catalysts are important in nature and in industry. This article is from Catalyst: Secondary Science Review 2008, Volume 18, Issue 3. Catalyst is a science magazine for students aged 14-19 years. Annual subscriptions to print copies of the magazine can…