![]() So next time you need a way to show density to kids, try the egg experiment. Farmers can turn on huge fans to rotate the warmer air aloft and "stir up" the atmosphere in an effort to save their crops. That cold, dense air sinks to the ground and can damage crops. Think about freezing temperatures and frost setting into our fruit crops in September or October. This of course has huge weather ramifications since rising air means cloud formation and perhaps precipitation. The warmer air rises because it's less dense. Two litres of filtered tap water for each sample was prepared after adding Phe-d10 as a surrogate standard. Each sampling site was analysed in duplicate. Cold, dry air is more dense than warmer, moisture-filled air. All tap water samples were filtered through a 0.7 µm glass fibre filter membrane (Millipore). Tapped density can be calculated using Eq. The tapped density of a powder represents its random dense packing. Now, if we said which one is more dense, it would be the metal/lead.Īir has density too. Tapped density of a powder is the ratio of the mass of the powder to the volume occupied by the powder after it has been tapped for a defined period of time. I remember my dad always told the joke "Which weighs more, a pound of feathers or a pound of lead?" Most say the lead of course, but the fact remains they both weigh the same because it's a pound. Perhaps density can be described this way too. By increasing the density of the water and adding salt, and essentially adding more molecules per square inch, the egg simply floats. That means the eggs float since the water almost weighs more. Why does that matter? Well, the water becomes more dense than the egg itself. ![]() When the second glass is filled with the same tap water, we changed the game/dynamics by adding three tablespoons of Morton table salt. There are more molecules per square inch. The egg is heavier than the water that surrounds it, so it sinks to the bottom. In short, when one glass is filled with normal, everyday tap water, and an uncooked egg is dropped in, it sinks. You'll also need two glasses, water, and table salt, as well as two eggs. This experiment deals with density (how heavy something is) and the effects are demonstrated using eggs. That said, we had to keep things simple for the age group. When we stopped by Plainfield Child Care in Grand Rapids, we discovered some very young kids that we were eager to learn. ![]()
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