Light wands are small tubes that can be used to give off light without electricity or fire. a light wand keeps two fluids separate from each other until the wand is bent. once the wand is bent, the tube holding the inner fluid breaks, and the two fluids mix together inside the wand.

Pressure is a measure of force per unit area or p=f/ap=f/a. a student is checking the amount of pressure their car exerts upon the road. the car weighs 22 tons ( us short ton ). the student finds the dimensions of each tire's footprint on the road is 12.5 cm x 16.5 cm. in pounds per square inch (psi), what is the total pressure the car exerts upon the road?