Question 715194
At 500 degrees, the time doubling to burn was 10 times.  {{{1*2^10=1000}}}approximately.  Actually, computationally, {{{2^10 = 1024}}}.



Using k=-0.0693, and d for change from 600 degree centigrade, we may use t=1*e^(kd).  For 500 centigrade, {{{d =-100}}}.


{{{t=1*e^(-0.0693*(-100))}}}
{{{t=1022}}}, seconds. Near enough, errors based on electronic handheld calculator.