ɪnðə kˈeɪs əvə skˈeɪlɪnvˈɛɹiənt tˈaɪp ʌv sˈɪstəm wˌɛɹ ɐ sˈɪstəm ʌv vˈɑːljuːm hɐz ɛɡzˈæktli ðə sˈeɪm sˈɛt ʌv mˈaɪkɹoʊstˌeɪts æz sˈɪstəmz ʌv vˈɑːljuːm, ðˈɛn wɛn ðə sˈɪstəm ɛkspˈændz nˈuː pˈɑːɹɾɪkəlz ænd ˈɛnɚdʒi wɪl flˈoʊ ɪn fɹʌmðə ɹˈɛzɚvwˌɑːɹ tə fˈɪl ðə nˈuː vˈɑːljuːm wɪð ɐ həmˈoʊdʒniəs ɛkstˈɛnʃən ʌvðɪ ɚɹˈɪdʒɪnəl sˈɪstəm.
In the case of a scale-invariant type of system (where a system of volume  has exactly the same set of microstates as  systems of volume ), then when the system expands new particles and energy will flow in from the reservoir to fill the new volume with a homogeneous extension of the original system.