Calculate the electric dipole moment based on charge magnitude and bond separation distance.
Input Parameters
e
Å
Calculation Results
Enter charge (in elementary charge units e) and distance (in Å) to calculate dipole moment
About this calculator
Overview
Dipole moment (μ) measures charge separation in polar molecules and bonds. It's a vector quantity with both magnitude and direction, calculated as charge times distance. Dipole moments explain intermolecular forces, solubility, and many physical properties of matter. Zero dipole moment indicates perfect symmetry or nonpolar character.
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Pro Tips
Charge input: Use partial charges (0.3-0.5 e) for covalent bonds, or full charges (±1 e) for ionic bonds.
Distance units: Ångstroms (Å) for molecular bonds, or meters (m) for macroscopic dipoles.
Direction matters: Dipole vectors point from positive to negative charge—important for molecular orientation.
Symmetry rules: Linear molecules (CO₂) and tetrahedral with identical substituents (CCl₄) have zero net dipole.
Temperature effects: Dipole moments decrease with temperature as molecular motion randomizes orientations.
Units: 1 D = 3.336 × 10⁻³⁰ C·m; water = 1.85 D; strong dipoles > 3 D, weak < 1 D.
Vector addition: Total molecular dipole is vector sum of all bond dipoles—use geometry for accurate calculation.
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Fun Facts
"Water's dipole moment (1.85 D) creates hydrogen bonding, making ice less dense than liquid water—life depends on this anomaly!"
"CO₂ has polar C=O bonds but zero net dipole due to linear symmetry—perfect cancellation creates a nonpolar molecule."
"Peter Debye (unit namesake) won the 1936 Nobel Prize for dipole moment research and X-ray diffraction studies."
"The strongest molecular dipole is cesium fluoride (CsF) at 7.9 D—almost as polar as ionic bonds get!"
"Benzene has zero dipole moment despite polar C-H bonds because the hexagon's symmetry cancels all vectors perfectly."
"Dipole moments explain why oil and water don't mix—water's strong dipoles create cohesive 'networks' that exclude nonpolar molecules."
"Microwave ovens heat polar molecules like water (μ = 1.85 D) but not nonpolar ones like oils (μ ≈ 0 D)."
"Proteins fold based on dipole interactions—amide bonds create dipoles that stabilize α-helices and β-sheets."
"The Earth's magnetic field induces tiny dipoles in compass needles, aligning them north-south."
"Piezoelectric crystals generate electricity from mechanical stress by creating dipoles in their crystal lattice."
