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SI units
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UK scientists working towards a redefinition of the kilogram
Scientists at the National Physical Laboratory (NPL) have released new research results that could affect how we measure a kilogram — the last SI unit based on a manufactured object. The International System of Units (SI) is the foundation for all our measurements from the beer in your pint to the gap between the tick and the tock on your clock.
SI units are defined by the General Conference on Weights and Measures. The next meeting of the conference, in November 2007, will consider a range of issues related to the maintenance of the SI, including an initial proposal to prepare for the redefinition of several of the base units.
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What is Mole Day?
"Mole Day is an unofficial holiday celebrated among chemists in North America on October 23, between 6:02 AM and 6:02 PM, making the date 6:02 10/23 in the American style of writing dates. The time and date are derived from the Avogadro constant, which is approximately 6.022×1023, defining the number of particles (atoms or molecules) in a mole, one of the seven base SI units."
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Metric Table for Cooking
Following are approximate conversions. The Imperial "tablespoon" is generally interpreted as half a fluid ounce (the measure used in the following table), but sometimes as five eights of an ounce (which would be approximately 17.76 milliliters).
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Education: memorize metric system
A mnemonic (pronounced [nəˈmɒnɪk] in RP, [nɪ'mɑnɪk] in GA) is a memory aid that generally serves an educational purpose. They are mostly verbal, e.g a word, each of whose letters help the user to remember the first letters of items in a list. However, there are also other types of mnemonics, such as visual mnemonics. Mnemonics rely on associations between something that is easy to remember, and something that is harder to remember. Sometimes mnemonics are chosen to directly relate to the target information, and othertimes they are arbitrary.
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