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The substance X is steam when compressed transformed into liquid. The particles of steam moves randomly, the kinetic energy of particles is high and the interspace between the particles is more than liquid.
The substance is surely steam which on compressing turns to liquid.the kinetic energy in gases are the greatest and the particle of steam(gas)move randomly.Their interparticular space is the greatest and and intermolecular force of attraction is lowest .they can be compressed to liquid form whit the change in temperature and pressure . In gases the spaces between the particles is more than the other two state so they can be compressed the most to bring the particles closer (as possible)
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