Vector
Definition and meaning of Vector in chemistry.
A vector is a mathematical quantity that possesses both a magnitude and a specific direction in space. In chemistry, vectors are often used to represent physical properties like dipole moments, velocity, and force.
In more detail
Many chemical phenomena cannot be fully described by a simple number and require directional information. For instance, the overall polarity of a molecule is determined by the vector sum of its individual bond dipole moments. If the individual vectors cancel each other out due to molecular symmetry, the molecule is nonpolar overall. Vectors are manipulated using specific mathematical rules, such as vector addition and dot products, which are essential for understanding molecular spectroscopy and quantum mechanics.
Key facts
| Field | Physical Chemistry |
|---|---|
| Components | Magnitude and direction |
| Contrast | Scalar (magnitude only) |
The dipole moment of water (H2O) is a vector pointing from the partially positive hydrogen atoms toward the partially negative oxygen atom.
Frequently asked questions
How is a vector different from a scalar?
A scalar only has a magnitude (like mass or temperature), whereas a vector has both a magnitude and a direction (like velocity or dipole moment).