Monthly Archives: October 2018

Ruler to convert miles to km — Miles and kilometers ( km ) are both units of length usually used to measure out large traveling distances. The km is an SI unit defined as 1000 meters. A mile is an English unit set to be equal to 5280 feet. The conversion factor between miles and meters was […]

Convert Miles to Km Example Problem

This entry was posted on October 30, 2018 by Todd Helmenstine (updated on May 26, 2022)

This colored periodic table is a brightly colored periodic table suitable for printing. The table contains all 118 known elements and each element’s number, symbol, name, and atomic mass. The color scheme shows the different element groups and is light enough to write in any other useful information or notes you […]

Colored Periodic Table – Printable Periodic Table

This entry was posted on October 29, 2018 by Todd Helmenstine (updated on May 2, 2021)

Examples of Solids, Liquids, Gases, Plasma — Get 10 examples of solids, liquids, gases, and plasma. These are the four main states or phases of matter. Learn about phase transitions.

10 Examples of Solids, Liquids, Gases, and Plasma

This entry was posted on October 29, 2018 by Anne Helmenstine (updated on January 9, 2023)

Examples of pure iron (Alchemist-hp) — Iron is an element that is essential for human life and found in pure form as well as alloys. It is found in hemoglobin in red blood cells and cast iron cookware. Here are interesting element facts about iron, a transition metal with the element symbol Fe and atomic number […]

Iron Facts – Atomic Number 26 or Fe

This entry was posted on October 26, 2018 by Todd Helmenstine (updated on May 10, 2021)

Inches and centimeters both units of length. The inch ( in ) is a British imperial unit defined as 1⁄12th of a foot. The centimeter ( cm ) is 1⁄100th of the standard meter. They can be converted using a conversion factor of 1 inch = 2.54 centimeters. These two worked […]

Convert In to Cm (Inches to Centimeters) Example Problem

This entry was posted on October 23, 2018 by Todd Helmenstine (updated on May 3, 2021)

Unit Conversion Chart — Unit conversion problems constitute the first week of nearly every science course. Measurement is a basic skill in science, but not all measurement methods are the same. People measure the same thing in different ways and use different units. To communicate between scientists, there has to be a method of […]

Unit Conversion Example Problems

This entry was posted on October 22, 2018 by Todd Helmenstine (updated on November 24, 2021)

This spooky Halloween pumpkin glows in the dark. — It’s easy to make a glow in the dark pumpkin with a jack-o-lantern face. Because you don’t have to carve the pumpkin, it lasts a long time. The eerie glow looks really spooky! Glow in the Dark Pumpkin Materials It’s very easy to make a glow in the dark pumpkin […]

Glow in the Dark Pumpkin for Halloween

This entry was posted on October 22, 2018 by Anne Helmenstine (updated on May 10, 2021)

Copper sulfate burns with more of a blue-green flame. (Anne Helmenstine) — Illuminating your Halloween jack o’ lantern with green fire is way more interesting than using a candle. Green fire just looks witchy! The effect is easy to achieve and yields fantastic results. Green Fire Jack o’ Lantern Materials You only need a few basic materials to put green fire in […]

Make a Green Fire Jack o’ Lantern

This entry was posted on October 15, 2018 by Anne Helmenstine (updated on December 22, 2021)

If you want to hear the aurora sound, listen on a calm, clear night. (Luke Stackpoole) — Do the Northern Lights or aurora borealis make a sound? The answer is yes. However, not everyone hears the sound and not all aurora produce it. Eyewitness Accounts of the Aurora Sound Several credible witnesses in both the Northern Hemisphere (aurora borealis) and Southern Hemisphere (aurora australis) report hearing a […]

Does the Aurora Borealis Make a Sound?

This entry was posted on October 15, 2018 by Anne Helmenstine (updated on December 16, 2018)