The density and volume of vegetable oils and water in contact with carbon dioxide and nitrogen have been measured with a magnetic suspension balance coupled with a high pressure view cell. Pressure and temperature were varied from atmospheric pressure to about 30 MPa and from room temperature to 80 degrees C, respectively. The density of water, corn oil and palm oil increases with increasing pressure by up to about 5%. The volume increases up to about 6% for water and up to about 45% for corn oil and palm oil, due to the solvation of carbon dioxide.