The atomic number of an element can be changed by gaining or losing electrons.

Temperature measures the total energy of a substance.

Lifting a book increases its kinetic energy.

Energy can be destroyed but not created.

The greater the mass of an object, the less its inertia.

The wavelength of a sound wave is directly proportional to its frequency.  

One kilogram equals 1,000 grams.

The conversion factor between inches and centimeters is 10 inch = 25.4 cm.

Density measures how heavy an object is.

A thermos bottle minimizes heat transfer by radiation using a silvered inner surface.