Qualitative - observations that do not involve measurements and numbers ("My brother is shorter than my sister," is a qualitative observation.)
Quantitative - observations that involve measurements and numbers ("My brother is 30cm shorter than my sister," is a quantitative observation.)
Quark - one of the two basic building blocks of matter
Radiation - the transportation of heat from one place to another by waves or particles (The Earth is warmed by the Sun due to radiation.)
Resistance - a measurement of how much a material opposes the flow of electricity (Wood has high resistance so it is a poor conductor of electricity. Copper has low resistance, so it is a good conductor of electricity.)
