<Tr> <Td> constant of integration </Td> <Td> varied depending on context </Td> </Tr> <Tr> <Td> c (\ displaystyle c) </Td> <Td> speed of light (in vacuum) </Td> <Td> 299,792,458 meter per second (m / s) </Td> </Tr> <Tr> <Td> speed of sound </Td> <Td> 340.29 meter per second (m / s) </Td> </Tr> <Tr> <Td> specific heat capacity </Td> <Td> joule per kilogram per kelvin (J kg K), or equivalently, joule per kilogram per degree Celsius (J kg ° C) </Td> </Tr>

What does the u symbol mean in physics