units_metric1 http://www.openmath.org/cd/units_metric1.ocd 2006-08-27 experimental 2004-08-27 3 0 This CD defines symbols to represent the basic physical units in the SI (syst\'eme international) system of units. It should probably be renamed units_si. metre This symbol represents the measure of one metre. This is the standard SI unit measure for physical distance. This is a base unit for the SI system metre_sqrd This symbol represents the measure of one metre squared. This is the standard SI measure for physical area. litre This symbol represents the measure of one litre. This is a standard metric measure for physical volume. A litre is, since 1964, a cubic decimetre, or a thousandth of a cubic metre, as the FMP below states. 1 3 litre_pre1964 This symbol represents the previous (1901-1964) measure of one litre. This used to be a standard metric measure for physical volume. A litre is, since 1901 and until 1964, the volume occupied by a kilogramme of water at maximum density and standard pressure. The difference is about 0.0028%. 1 metres_per_second This symbol represents the measure of one metre per second. This is the standard SI measure for speed. 1 metres_per_second = 1 metre in 1 second metres_per_second_sqrd This symbol represents the measure of one metre per second squared. This is the standard SI measure for acceleration. 1 metres_per_second_sqrd = 1 metres_per_second (change) in 1 second second This symbol represents the measure of one second. This is the standard SI measure for time. The Si unit is the same as the UTC unit, to which we refer gramme This symbol represents the measure of one gramme. This is not quite the standard SI measure for mass, which is the kilogramme, but OpenMath chooses to regard the gramme as standard, otherwise one would have to call it the milli-kilogramme. This is a basic unit of the SI system Newton This symbol represents the measure of one Newton. This is the standard SI measure for force. Joule This symbol represents the measure of one Joule. This is the standard SI measure for energy. Watt This symbol represents the measure of one Watt. This is the standard SI measure for power. degree_Kelvin This symbol represents the measure of one degree Kelvin. This is a standard SI measure for temperature relative to absolute zero. 1 degree Kelvin = 1 - 273.15 degrees Celsius 1 degree_Celsius This symbol represents the measure of one degree Celsius. This is a standard metric measure for temperature. Pascal This symbol represents the measure of one Newton per square metre. This is the standard SI measure for pressure. Newton_per_sqr_metre This symbol represents the measure of one Newton per square metre. This is another (deprecated in OpenMath) name for the standard SI measure for pressure, the Pascal. Coulomb This symbol represents the measure of one Coulomb. This is the standard SI measure for charge. amp This symbol represents the measure of one amp. This is the standard SI measure for current. volt This symbol represents the measure of one volt. This is the standard SI measure for voltage.