how can you make your data repeatable, reproducible, accurate and precise?
repeat the practical at least 3 times, try doing a second set of readings with another instrument, make sure the measurements are correct and calculate the mean for your data to be precise
kg to J= x1000
dmcubed to cm cubed=x1000
evaluations
was it valid and a fair test? any anomalies? enough evidence? a better method for it?