A measure of the force of gravity on an object
The amount of matter in an object, which does not change with location even if the force of gravity changes.
International System of Units
The scientific system of measurements used everywhere.
The amount of space that matter occupies.
A measure of the mass of a material in a given volume.
Please allow access to your computer’s microphone to use Voice Recording.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Your microphone is muted
For help fixing this issue, see this FAQ.