// "integrating out" one variable domain
unit conversion on;
import nsrunit;
math integral2 {
  realDomain t sec; t.min=0; t.max=6; t.delta=1; // time (seconds)
  realDomain x m; x.min=0; x.max=1; x.delta=0.1; // space (meters)
  real u(t,x) = t^2*(1 mole/sec^2) + x^2*(1 mole/m^2); // u (mole)
  real v(t) = integral(x=x.min to x.max, u); // v (mole*meters)
}