Energy (most commonly directly added as heat) is added to a liquid. This causes the molecules/particles to move more quickly, making them break apart and form into a gas. Instead of directly adding heat to the substance, pressure can be added, which, according to the ideal gas laws, as pressure goes up, temperature also goes up.
Truman's ordered the armed force to desegregate, or stop separating people based on race. He told the Justice Department to carry out any civil rights laws that were already in force. He want to protect African Americans better.
