It is tempting to think that some materials are always heavier than other materials. For example, someone might say that metal is heavier than air. But it depends on how much of each material there is ...

DEXA scans—which stands for dual x-ray absorptiometry—measure bone density by passing a high- and low-energy x-ray beam ...

A common question arises: can density be determined using the free space measured on a gas adsorption analyzer, rather than a device specifically designed for density measurement? This article ...

(Nanowerk Spotlight) The density of proteins in solution is an important fundamental biophysical quantity that has not been accurately measured yet. This has led to extensive debate in the literature ...

Join our daily and weekly newsletters for the latest updates and exclusive content on industry-leading AI coverage. Learn More In a world of ubiquitous global positioning, tracking a crowd’s movement ...

Scientists have measured the density of liquid iron -- the main component of rocky planet cores -- under conditions similar to Earth's liquid core: 1,000,000 atmospheres and 4,000 degrees Celsius.