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In this activity, learners discover the primary physical properties used to separate pure substances from mixtures.

In this lab activity, learners explore how to initiate a density current. Learners measure six flasks with different concentrations of salt and water (colored blue).

In this activity, learners discuss the different salinities of oceans, rivers and estuaries.

In this math lesson, learners analyze the density of liquids in order to explore linear functions.

In this activity, learners can create five-layer density columns by employing one of three (or all) methods.

Learners observe working lava lamps to understand how they work (included in PDF link).

In this activity, learners build a hot air balloon using just a few sheets of tissue paper and a hair dryer.

In this activity, learners are introduced to robotic submarines called gliders. Learners make “gliders” from plastic syringes and compare these to Cartesian bottles and plastic bubbles.

In this activity, learners make their own heat waves in an aquarium.

In this activity, learners are challenged to design a planktonic organism that will neither float like a cork nor sink like a stone.

In this chemistry activity, learners use spaghetti to explore density and chemical reactions.

Learners create three solutions with different levels of salinity. They compare the density of these solutions by coloring them and layering them in a clear plastic cup and in a soda bottle.

In this quick and easy activity and/or demonstration, learners illustrate the effect of the weight of air over our heads.

Making liquids of different densities to perfectly lay on top of each other can be a frustrating exercise. The Exploratorium created this activity as a fool proof way of making a density column.

In this activity, learners explore density, convection, stratification, and, by inference, the melting of icebergs. Learners make hypotheses, test their hypotheses, and explain their observations.

In this experiment, learners float colored ice cubes in hot and cold water.

Learners pour equal amounts of coffee, mineral oil, corn syrup, and alcohol into a beaker. The liquids resolve into stacked layers, and learners can infer which liquids are the most and least dense.

In this activity, learners prepare four polymer elastomers and then compare their physical properties, such as texture, color, volume, density, and bounce height.

Build a hydrometer (measures the density of a liquid) using a pipet or eyedropper.

In this activity, learners are introduced to challenges of maintaining temperatures while living in space.