In practice , however , the definition means that high-precision realizations of the second should compensate for the effects of the ambient temperature -LRB- black-body radiation -RRB- within which atomic clocks operate , and extrapolate accordingly to the value of the second at a temperature of absolute zero .

In practice , however , the definition means that high-precision realizations of the second should compensate for the effects of the ambient temperature -LRB- black-body radiation -RRB- within which atomic clocks operate and extrapolate accordingly to the value of the second as defined above .
