1. The problem statement, all variables and given/known data After turnig of magnetic-optic pit, cold cloud of atom 87 Rb is expanding. Size of cloud after time t, is given with relation: where, k_B is Boltzman constant, m mass of 87 Rb. Draw a plot, then use least squares method to find temperature T, and initial size of cloud sigma_0, for next results of measurement. t(ms) sigma(mm) 3. The attempt at a solution I am familiar with least squares method. What I dont understand in this problem is next. First of i must get this formulae to some linear shape ( regrression). So, ok, firstly we square the whole equation. I get next. now, on to assigning values to get form like y=ax+b, its obvius, y= sigma^2 b=sigma_0^2 x=t^2 x= (k_B * T)/m and now, to use least square methd, i must calculate, x,y,xy,x^2,y^2, and sum of them all. my question here is next: This member boltzman constant/m. What should i do with it? Shuld i calculate it and continue to multiply numbers with it whole process? Or just write results like 0.157746 * ( K-b/m) and in the end multiply a with it?