COMPRESSIBILITIES AND ISOCHORES OF (C3F7COOCH2)4C, c-Si4O4(CH3)8, n-C5H12, n-C8H18, 2,2,4-C5H9(CH3)3, c-C5H10, c-C6H12, c-C6H11CH3, C6H5CH3, p-C6H4(CH3)2, s-C6H3(CH3)3, CH2Cl2