Phase diagram can be constructed that show the effect of more than two variables on the phase of a substance. Phase diagrams can use other variables in addition to or in place of temperature, pressure and composition, for example the strength of an applied electrical or magnetic field, and they can also involve substances that take on more than just three states of matter. One type of phase diagram plots temperature against the relative concentrations of two substances in a mixture called a "binary phase diagram", as shown at right. Such a mixture can be either a solid solution, eutectic or peritectic,
I'm Not a Girl, Not Yet a Woman basic sequence of E♭–A♭2–Fm7–B♭ as its chord progression. "I'm Not a Girl, Not Yet a Woman" received positive reviews from music critics. "Yale Daily News" writer Catherine Halaby called it a "well-executed ballad", while observing that "it comes across as a hybrid of advice to her young female fans on how to deal with puberty, and an explanation of her girly but not childlike attitude." Jim Farber of the "Daily News" while reviewing the Dream Within a Dream Tour, called the song "sugar pop dittie", along with Spears' previous ballad single "Don't Let Me Be the Last to Know". Nikki