noun, noun which may take the genitive case particle 'no'
real space; position space
Technical term in quantum mechanics, contrasting with momentum space (運動量空間). Used as both a noun and with の to modify other nouns.
See also: 運動量空間
量子力学では、実空間と運動量空間の間でフーリエ変換が用いられる。
In quantum mechanics, Fourier transforms are used between real space and momentum space.
この波動関数を実空間で表すと、次のようになる。
When this wave function is expressed in real space, it becomes as follows.
Compound of 実 (real) and 空間 (space), likely a calque from English 'real space' in physics contexts.