7.00

7.48

7.96

6.52

${{\rm{H}}_2}^{18}{\rm{O}}$

${{\rm{D}}_2}{\rm{O}}$

${{\rm{D}}_2}^{18}{\rm{O}}$

${{\rm{H}}_2}{\rm{O}}\;{\rm{ at}}\;4^\circ C$

One proton and no neutrons

One proton and one neutron

One proton and two neutrons

Two protons and one neutron

$100^\circ C$

$101.4^\circ C$

$104^\circ C$

$102.5^\circ C$

$10,{\rm{ }}10,{\rm{ }}10$

$8,{\rm{ }}10,{\rm{ }}11$

$10,{\rm{ }}11,{\rm{ }}10$

$11,{\rm{ }}10,{\rm{ }}10$

Insoluble impurities like silica

Impurities like carbonates and bicarbonates of calcium and magnesium

High density and different physical properties than those of water

The capacity to expedite the rate of nuclear reactions

${{\rm{H}}_2}^{18}{\rm{O}}$

${{\rm{D}}_2}{\rm{O}}$

${{\rm{D}}_2}^{18}{\rm{O}}$

${{\rm{H}}_2}{\rm{O}}\;{\rm{ at}}\;4^\circ C$

Higher viscosity of $D_2O$ compared to $H_2O$.

Difference in zero-point vibrational energies of the O-H and O-D bonds.

Greater dielectric constant of $D_2O$ compared to $H_2O$.

Difference in the nuclear spins of deuterium and hydrogen.

$100^\circ C$

$101.4^\circ C$

$104^\circ C$

$102.5^\circ C$

${{\rm{H}}_2}{{\rm{O}}^{18}}$

${{\rm{D}}_2}{\rm{O}}$

${{\rm{T}}_2}{\rm{O}}$

${{\rm{H}}_2}{{\rm{O}}^{17}}$

(i) and (ii)

(i), (ii) and (iii)

(ii) and (iii)

(i) and (iii)