Science Notes Posts

Grams to Kilograms — Grams (g) and kilograms (kg) are the two most common units of mass in the metric system. It’s easy to convert grams to kilograms by cancelling units: Another way to convert g to kg is to simply move the decimal point three spaces to the left. So, for 1536 g […]

Grams to Kilograms Conversion Examples

This entry was posted on July 20, 2018 by Anne Helmenstine

This example problem illustrates the steps to convert from gallon to liter. This problem is a common homework conversion to help students move from one system of measurement to another. In this case, the liter is an SI unit of volume and the gallon appears in two different forms: the […]

Gallon to Liter Conversion Example Problem

This entry was posted on July 17, 2018 by Todd Helmenstine

Gas Tank for Density of Ideal Gas Example — A common homework problem involving the ideal gas law is finding the density of an ideal gas. The idea of the problem is to bring in previously learned concepts of density and molecular mass into problems involving mostly pressures, volumes, and temperatures. This example problem will show how to find […]

Density of an Ideal Gas Example Problem – How to ...

This entry was posted on July 11, 2018 by Todd Helmenstine

Table of Edible pH Indicators (Todd Helmenstine) — Red cabbage juice is the best known edible pH indicator, but there are many safe fruits, vegetables, and flowers that change color in response to acidity or alkalinity. The plant pigments responsible for the color change are anthocyanins. Most of these molecules change from red to purple to blue in […]

Edible pH Indicators From Your Kitchen and Garden

This entry was posted on June 23, 2018 by Anne Helmenstine (updated on July 18, 2018)

The largest solstice celebration in the world is at Stonehenge in England. — The solstice is the longest or shortest day of the year, depending on whether you live in the Northern or Southern Hemisphere. It marks the official beginning of summer and winter. Here’s a collection of useful and interesting solstice facts. The Solstice Marks the Longest and Shortest Day of the […]

Solstice Fast Facts

This entry was posted on June 21, 2018 by Anne Helmenstine (updated on June 28, 2018)

Cats eat grass because it's a good source of certain nutrients, may help their digestive system, and simply because they enjoy it. (Ethan Weil) — Why do cats eat grass? The answer is that it offers some health benefits. Cats are obligate carnivores, which simply means they need to eat meat to satisfy their nutritional needs, yet wild cats naturally ingest some grass with prey. Both wild cats (e.g., bobcats, lions, and tigers) as well […]

Why Do Cats Eat Grass?

This entry was posted on June 18, 2018 by Anne Helmenstine (updated on June 28, 2018)