And it even floats – in cold water. Do not use hot water, as it can melt the hot glue and your boat will fall apart.

Also, even though a crayon is made mostly from wax, most crayons sink. This is because of the pigments and other substances added to the wax to give them color and to improve other qualities of the crayon.

Light objects are pushed back to the surface by an object’s upthrust. If the item is too heavy, the upthrust will not be strong enough to push it up, causing it to sink. For example, many children noted that the scissors are made of metal and the metal is heavy, causing the scissors to sink.

Answer: it depends of the pen is heavier than water or lighter that water. most of the pens sink only rarely pens are lighter than water.

The two coins have the same surface area (they are the same size), but the dime is denser. So the dime is heavier and is able to break through the strong water bonds and sink. When an object is less dense it will float.

The paper towel will get soaked and will sink in a few seconds but the paper clip will continue to float. Add a drop of soap/detergent somewhere near the paper clip.

Float an aluminum coin on water. Hold the coin on the tines of the plastic fork, lower the coin onto the surface of the water, be careful to keep the coin level. Drip a drop of water on top of the coin, if the drop touches the water at the edge of the coin, the coin will sink.

When salt is dissolved in water, as it is in ocean water, that dissolved salt adds to the mass of the water and makes the water denser than it would be without salt. Because objects float better on a dense surface, they float better on salt water than fresh water. Density is defined as mass per unit volume.

An egg floats in salt water because the mass of the salt water displaced is equal to the mass of the egg. The egg’s density is less than the density of the salt water.