The pressure−volume−temperature (PVT) relationships for trimethoxymethylsilane (MTMS, CH 3 (CH 3 O) 3 Si) and tetramethyl orthosilicate (TMOS, (CH 3 O) 4 Si) were measured at temperatures ranging from 303.2 to 363.2 K and pressures up to 160 MPa. Density measurements were carried out with an experimental apparatus based on the variable volume method. The standard uncertainties u(T) = 0.17 K and u(P) = 0.14 MPa, and the relative combined expanded uncertainty U r (0.95 level of confidence) were U r (ρ) = (0.0016 and 0.0022) for MTMS and TMOS, respectively. The obtained PVT relationships were correlated using the Tait equation and the Sanchez− Lacombe equation of state to determine the characteristic parameters.

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