- Home
- Reference
- Education
- Directories
- Science eStore
- Job Board
- Ask The Experts
- eGreetings
- Fun
- About Us

Welcome to PhysLink.com - Your physics and astronomy online portal. Stay a while! Check out our extensive library of educational and reference materials. Also, check out our fun section!

QuestionWhat is the volume of Earth? Asked by: Dallas AnswerThe earth is approximately a sphere (actually it is sphere slightly flattened at the poles). Its volume can be calculated if you know its radius. Use the equation for the volume of a sphere which is V = 4/3 x Radius ^{3}
The mean radius of the earth is approximately 6.4 million meters (exact = 6.37 x 10 ^{6} m). Its volume is then:
(4/3) x 3.14 x 6400000 ^{3} m^{3}
This comes to 1,097,509,500,000,000,000,000 cubic meters. Needless to say, this is very large! Inside of one cubic meter you could fit seven or eight high school students. I know, I teach high school and I have fit eight students in a cubic meter! So, this would be 137,188,690,000,000,000,000 students. Is your high school this big? This number of students is so large that if you could count one number per second it would take you more than 4 trillion years to count this high. If you counted by millions it would still take you over a million years to get to this number! It would take you over eight million years to count to the number of cubic meters the earth is. So, the earth is very large indeed! Answered by: Tom Young, B.A., Science Teacher, Whitehouse High School |

Loading

(

10 Ways to Keep Your Kids Interested In Science

Young children are natural scientists: they ask questions, pick up sticks and bugs outside, and are curious about the world around them. But as they get a bit older, many kids gradually lose their interest in science. They might see it as just another task at school, something that doesn't apply to their lives. Of course nothing could be further from the truth, so here are ten ways you can remind your kids that science is everywhere. Most of these are fun for adults, too! Continue reading ...

Here are our physics & astronomy bestsellers:

Magnetic Levitator - Classic

12 inch Galileo Thermometer

Cricket, Locust, Beetle and Crab

Solar Radiometer

Weather Station 4M Kit

3D Magnetic Field Tube

Clean Water Science 4M Kit

Revolving Multi-Color Fiberoptic Light

Space Wonder Gyroscope

Mini Plasma Ball