In this experiment we let radiation from
the Sun raise the temperature of a measured
amount of water. Then, by making careful measurements
of the temperature rise andthe water
volume (from which we may obtain its mass)
we will be able to say how much energy the
water has received. Knowing the amount of
time over which the radiation energy was
collected and the cross-sectional area of the
container, we will finally be in a position to
calculate the ground-level solar constant.