Mrs. Johnson's kid is trying to drink with a straw that runs through an airtight cork in the top of a bottle of water. Please explain to her kid why he won't get any water.

straws operate because atomospheric pressure pushes the water up. A cork prevents that.

a straw works because when you lower the pressure on one end (by sucking), atmospheric pressure pushes the liquid from the other end

the airtight cork prevents the atmospheric pressure from pushing on the liquid, so it won't go up the straw

To explain to Mrs. Johnson's kid why he won't get any water when trying to drink through a straw with an airtight cork on the bottle, we need to understand the concept of air pressure.

1. Start by explaining what air pressure is: Air pressure is the force exerted by the weight of the air around us. Air molecules push against any surface they come into contact with, including the surface of the water inside the bottle.

2. Next, explain the role of air pressure in drinking with a straw: When you use a straw to drink, you create a vacuum inside the straw by sucking the air out. This decreases the air pressure inside the straw.

3. Now, discuss the importance of balanced pressure: In order for the water to come up through the straw, the air pressure inside the bottle needs to be balanced. When the kid tries to drink through the straw, the airtight cork prevents the air from getting inside the bottle to balance the pressure.

4. Point out the consequence of imbalanced pressure: Without balanced pressure, the higher air pressure outside the bottle pushes down on the surface of the water, making it difficult for the water to rise up the straw. As a result, the water stays inside the bottle and doesn't flow into the straw.

To get water through the straw, the airtight cork needs to be removed or loosened so that air can enter the bottle and balance the pressure. This way, when the kid sucks on the straw, the lower air pressure inside the straw will pull the water up and allow them to drink.