How much pressure is required to compress 1L volume of air at 1atm pressure to 0.5L

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change

Use the measurements in the table to determine which unidentified metal has the highest density. metal volume mass a 10.5 cm3 122 g b 14.2 cm3 132 g c 16.1 cm3 115 g d 12.7 cm3 126 g

Which diagram represents the phase tha occurs after a solid melts?