It is the accuracy in the estimate of the constant or the effect of rounding.
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A "constant"
If the distance is known to perfection, an acceleration is constant, then the absolute error in the calculation of acceleration is 2/t3, where t is the measured time.
6.626x10-34 m2kg/s is the value of Plank's constant.
No, gas constant is having a value of 8.314Jk-1mol-1 Whereas plancks constant has a value of 6.6*10-31
You multiply the percentage uncertainty by the true value.