Form factor

The term form factor may refer to:

Science

• Form factor (radiative transfer) or emissivity, the proportion of energy transmitted by that object which can be transferred to another object;
• Form factor (electronics), characterizing the functional form of oscillating signals.

Scattering theory

• Form factor (quantum field theory), a semi-empirical formula used in effective quantum field theories
• Electric form factor, the Fourier transform of electric charge distribution in space
• Magnetic form factor, the Fourier transform of an electric current distribution in space
• Atomic form factor, or atomic scattering factor, a measure of the amplitude of a wave scattered from an isolated atom

Forestry

• A form factor in timber metrics referring to the tree shape

Design

• Computer form factor, the industry-standard physical dimensions of the major components of computers
• Hard disk drive form factor, the physical dimensions of a computer hard drive
• Hard disk enclosure form factor, the physical dimensions of a computer hard drive enclosure
• Mobile phone form factor, the fundamental design of a mobile phone
• Small form factor, a system smaller than a traditional mini-tower, such as a book-sized PC or a miniature Home Theater PC (HTPC)
• Pizza box form factor, a style of case, usually wide and flat, for computers or network switches