This is not true. Scientists measure the density of anything they come across. Perhaps you are confused by the fact that it is easily possible to measure the volume of objects denser than water by dropping them in and measuring how the volume of liquid appears to go up. It's much more fiddly to measure the volume of objects which are less dense than water and so float in it.
Objects sink in water because they are denser than water, not necessarily because they are heavier.
because some objects are much denser(heavier) than water so they sink
Scientists know the masses of both Uranus and Neptune because of the effects of their gravity on other objects, and the fact that their sizes are easy enough to measure. Neptune has more mass than Uranus and is slightly smaller, which makes it denser.
Not necessarily. An object's weight is determined by its mass and the force of gravity acting on it. While larger objects may have more mass and therefore be heavier, there are scenarios where a smaller but denser object can be heavier than a larger but less dense object.
be denser and heavier than the one made up of lighter atoms. This is because denser materials have more mass packed into the same volume.
If two objects have the same volume but different densities, the object with the higher density will feel heavier. This is because density represents the amount of mass packed into a given volume; the denser object has more mass in the same volume, therefore it feels heavier when lifted.
They are heavier on Venus due to it's larger mass.
Atoms cause the objects to be denser when they are more compact it's denser and more spread out it's not denser
Objects float because the air in the object causes it to rise because it is less denser than water. Objects float better in salt water because the salt makes the water more denser helping even heavier objects to float. -Kimberly P.S. I learned all this in 4th grade!!!!!!!!!!!
Thing can get denser anywhere if it is colder. Just remember things never change in mass even if they become heavier or lighter, it is the gravitational pull that has changed the objects weight. Do not confuse mass with weight. Mass is the amount of matter present.
Denser, heavier air.
Objects that are heavier than water will sink down, such as metal objects or rocks. Additionally, liquids and gases can sink down into a denser medium, like oil sinking down in water or hot air sinking down in cooler air.