Measuring the density of an aircraft carrier

[bobsmith76]

An object floats if it is less dense than water. I'm assuming that an aircraft carrier can float because there are several rooms in it with air. What happens when the door on the upper most floor is opened? Does the air inside that room still contribute to the total average density of the ship? How exactly do you calculate the density of an aircraft carrier. Where do you draw the line when calculating its volume? If a door is open does the room to that door count towards the ship's volume regardless of whether or not the door is open or not?

 

[BadBrain]

An object floats if it is less dense than water. I'm assuming that an aircraft carrier can float because there are several rooms in it with air. What happens when the door on the upper most floor is opened? Does the air inside that room still contribute to the total average density of the ship? How exactly do you calculate the density of an aircraft carrier. Where do you draw the line when calculating its volume? If a door is open does the room to that door count towards the ship's volume regardless of whether or not the door is open or not?

The room contains air whether or not the door is open. Every atom and molecule aboard her contributes to her mass, the totality of which should remain less than the total mass of the water she's displacing, giving her buoyancy. If she gets torpedoed, and enough of her watertight compartments are open to the sea, the volume of air within her will rapidly be displaced by the denser water, and she will achieve decreasing buoyancy, followed by neutral buoyancy when the mass of the water plus steel plus everything else plus air she contains is equal to the mass of the volume of water she displaces, followed by negative buoyancy when the mass of the water plus steel plus everything else plus air she contains is greater than that of the volume of water she displaces, and she sinks.

 

[mrspeedybob]

Include the air below the water line. Here is why...

Think about a simplified case of a glass floating in a sink. The forces pushing the glass down are the weight of the glass and air pressure. Air pressure is the weight of the column of air above the glass. The force pushing it up is the water pressure below the water line. Part of the water pressure comes from the air pressure at the waters surface. The air pressure pushing down on the bottom of the glass however is slightly greater because it has a slightly taller column of air pushing down on it because the bottom of the glass is lower then the water line.

In other words the weight of the air from the water line up can be neglected because the same weight of air is pushing down on the water so the net effect on buoyancy is zero. The weight of the air below the water line however, must be considered because it is balanced against an equal volume of water.

 

[Drakkith]

Whether the door is open or closed doesn't matter, as the air pressure inside and outside the ship are pretty much equal. Also, I don't think it's really the density of the ship that matters, it is the total weight of the ship compared to the total weight of water it displaces. For example, if you put 500,000 tons of styrofoam on a platform on the ship, you could very well sink the ship! (At least until the foam began to submerge, but by then the ship is already submerged)

 

[PJC01]

I would like to address the questions posed regarding the measurement of density of an aircraft carrier. To begin with, the statement that an object floats if it is less dense than water is correct. However, in the case of an aircraft carrier, its design and construction take into consideration its overall density and weight distribution to ensure that it is able to float in water.

Regarding the question about the air inside the rooms contributing to the total average density of the ship, the answer is yes. The air inside the rooms adds to the overall weight of the ship and therefore, it is taken into account when calculating the density.

Calculating the density of an aircraft carrier is a complex process that takes into account various factors such as the weight of the ship, the volume of the ship, and the distribution of weight within the ship. The volume of the ship is typically calculated by measuring the length, width, and height of the ship, including all the compartments and rooms.

When it comes to drawing the line for calculating the volume of the ship, it is important to include all the enclosed spaces within the ship, including rooms with open doors. This is because, even with the door open, the room still contributes to the overall volume of the ship. However, open decks and open spaces may not be included in the volume calculation as they do not contribute to the weight of the ship.

In conclusion, measuring the density of an aircraft carrier is a complex process that takes into account various factors and it is important to include all the enclosed spaces within the ship in the volume calculation to get an accurate measurement of its density.