SAPS STUDY SUPPORT（削弱了研究支持）.pdfVIP

SAPS STUDY SUPPORT Symbols and Units N Bq J s -1 -2 °C Hz kg m s 1 tonne = 10 3 kg December 2003 Version 1.0 ©SAPS. Any part of this document may be photocopied for educational purposes within an educational institution. Permission for use in any other context must be obtained from SAPS. Symbols and Units: A survival guide Is the symbol for a million M or m? Does it matter which symbol we use? Why not read this Guide to find out the answer to the first question? Find out if you agree with us that the answer to the second question is yes! Introduction In science, it is important that we are able to present results in a way that minimises confusion. Scientists therefore adopt a common system for presenting data that is widely used and understood. This guide will: •help you remember the units and symbols that you may meet in your science courses •remind you of the importance of using units correctly. We recommend that you work your way through the guide section by section. There are six sections: 1. SI base units 2. Derived units 3. Secondary units and prefixes 4. Units outside the SI 5. Using SI units and their symbols 6. Some useful physical constants 1 1. SI base units For many years in the UK, teaching in schools and colleges has encouraged the use of SI unit