March 7, 2017

Ancient Science: 40 Time-Traveling, World-Exploring, by Jim Wiese

By Jim Wiese

Dig into the technology of precedent days and unearth striking discoveries!
* have you questioned the place paper comes from, who made the 1st recognized maps, or how the traditional Egyptians have been capable of construct the pyramids?
* do you want to make your personal sundial, detect how one can discover earthquakes, or learn how to write in hieroglyphics?
* Are you searching for nice rules in your subsequent technological know-how reasonable undertaking?

If you replied "Yes" to any of those questions, then historic technology is for you! From Greek lighthouses and Roman bridges to chinese language kites and Mesopotamian cleaning soap, you'll examine a number of the maximum medical discoveries and the folks who brought them to the realm. Dozens of fun-packed actions assist you see for your self how the earliest people cultivated crops, why tools make diversified sounds, how fireworks get their explosive energy, and masses extra. the entire initiatives are secure and simple to do, and all you wish is daily stuff from round the condo. So step again in time and take an grand trip with old technological know-how!

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Extra info for Ancient Science: 40 Time-Traveling, World-Exploring, History-Making Activities for Kids

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53 The rock displaces water that has the same weight as the weight loss of the rock due to being in the water. The buoyant force pushes up with a force of 2. This is equal to the weight of the water the rock displaces. Archimedes’ principle also explains why a boat floats. When an object is in water, buoyancy creates an upward force to counter the force of gravity pulling the object down. When an object like a boat, a surfboard, or even a cup filled with marbles is placed in water, it displaces, or moves, the water.

When you weigh the water that overflowed the pot when the rock was submerged, you will find that the weight will be the same as the difference between the weight of the rock in air and the weight of the rock in water. In More Fun Stuff to Do, the cup filled with the marbles and the cup filled with water will have the same weight. This activity demonstrates Archimedes’ principle, which states that an immersed object is buoyed up by a force equal to the weight of the fluid it displaces. In this activity, the rock weighs less in water than in air.

The other end of the molecule is a long chain of atoms called triglycerides (which come from the fat and oils). This end is hydrophobic, which means that it will repel water but is attracted to oily substances. Triglyceride molecule Hydrophobic end (attracted to dirt) Long chain molecules made from fats and oils Hydrophilic end (attracted to water) Alkali end (potassium or sodium) In this activity, you saw the effect that a soap molecule has on an oil molecule. When the soap molecule is mixed with water, it moves to the surface.

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