States of matter > energy changes

Students melt sodium thiosulfate crystals, and these are then cooled to a state well below the melting point. The melt now exists in a metastable supercooled state. The supercooled liquid will freeze rapidly on the addition of a crystal of sodium thiosulfate or dust particles, or on stirring. Students

The fact that water has a boiling point of 100 °C means that paper will not reach its ignition temperature if water is heated in a paper cup. The high