EntityQ9251458· pop 15· linked from 41 articlesobserver effectSign in to savefact that simply observing a situation or phenomenon necessarily changes that phenomenonConnectionsphysicsEntityenergyEntityQ7085EntityforceEntityquantum mechanicsEntityelectronEntityelectronicsEntitytemperatureEntityInternational Standard Book NumberEntityRichard FeynmanEntitythermodynamicsEntityvelocityEntityWerner HeisenbergEntityclassical mechanicsEntitymagnetic fieldEntityphotonEntityelectric fieldEntitydigital object identifierEntitymomentumEntityLev LandauEntityCategoriesPhysical phenomena