%% NaCl
gl = [10.05 20.25]; sg = [1.0053 1.0125];
igl = [gl(1) 14.62 gl(2)];

isg = interp1(gl,sg,igl);

disp(['grams/liter NaCl : ']);
disp([num2str(igl)]);
disp(['specific gravity of solution : ']);
disp([num2str(isg)]);
