Measuring the amount of deuterium in the universe allows us to set a limit on .the density of ordinary (baryonic) matter the universe

Explanation:

Measuring the amount of deu terium in the universe allows us to set a limit on the density of ordinary matter of universe. Density of the universe is about 9×10-27 kg m-3, because of the way in which deu terium was created in the Big B ang, an exact measurement of the amount of deuterium would allow scientists to set limits on the models of the great explosion.