Ademonstration of pressure could be done best with which of the following? a. a plastic and a pump b. ice in a glass and a thermometer c. a ping pong ball and a cold cupof water d. a wooden box with holes

The answer is A. The pump and the plastic are the only ones that create pressure compared to the other choices. When you exert a force on the pump to a closed object such as plastic, the pressure inside the pump that it gives off makes the plastic full of air. Pressure is defined to be the force per unit area or the stress within a fluid.

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant.