Like humans, plants can be negatively affected by overcrowding. Unlike humans, plants cannot get up and move to a new environment or explore how to utilize new resources. This experiment will explore the effects of crowding (population...

In this science fair project, use a precision hydrometer to measure the amount of sugar in soda. The Science Buddies project ideas are set up consistently beginning with an abstract, objective, and introduction, followed by a section on...

This project presents an interesting puzzle. A disk of wood will float face-up, that is, with its circular cross-section parallel to the surface of the water. A long log of wood, however, floats with the circular cross-section...

An activity to help you create a density column that contains layers of liquids that are separated by different densities.

This Science Buddies project explains how to build a mechanism that will reproducibly swing a hammer so you can determine the amount of force needed to hammer a nail through various densities of wood. The Science Buddies project ideas...

In this science fair project, students will make hot-air balloons using a toaster and dry-cleaning bags, and see how the size of the balloon affects its flight. The Science Buddies project ideas are set up consistently beginning with an...

In this science experiment, you will learn about density while making water fireworks!

A simple lab activity to demonstrate that ocean currents are influenced by changes in water density.

For this activity, students will investigate how temperature and currents affect the salinity of ocean water, making predictions after studying ocean maps. It is recommended that teachers do the experiment themselves before presenting it...