Which type of evidence is an empty gasoline can?

Which of the following bedside methods can absolutely confirm proper endotracheal tube posi-tion in the trachea?

a. Auscultation b. Observation of chest movement c. Tube length (cm to teeth) d. Fiberoptic laryngoscopy

Liquids that are not water soluble do not mix with water and either float on water or sink below it. This is termed the liquid's specific ____.

A. gravity B. solubility C. reactance D. solvency