Density Calculator

Which units must I use?

Mass in grams, volume in cubic centimetres and density in grams per cubic centimetre. The results add a line converting density to kg/m³ by multiplying by 1000, so 2.7 g/cm³ shows as 2700.00 kg/m³. Because 1 mL equals 1 cm³, a volume read from a measuring cylinder in millilitres can be typed in unchanged.

How do I tell it which quantity to solve for?

Leave the unknown at 0 and fill in the other two. Mass 500 with density 7.87 gives a volume of 63.5324 cm³. If all three fields hold non-zero numbers, the density field wins and volume is recalculated from mass and density: entering mass 100, volume 50 and density 5 reports a volume of 20.0000 cm³, not 50.

What is the "Material hint"?

The tool compares your density with eight reference values (water 1.00, aluminium 2.70, iron or steel 7.87, copper 8.96, lead 11.34, gold 19.32, oak 0.70 and glass 2.50 g/cm³) and names the closest one only if you are within 5%. A result of 0.917 g/cm³ gets no hint at all because nothing on the list is that close. A hint means similar density, not that the sample is that material.

Why are zero and negative inputs rejected?

Zero is the "solve for this" marker, so you cannot supply a real zero, and fewer than two non-zero values gives "Enter at least two values". Negative mass, volume or density produces a "must be positive" message, since none of them is physically negative.

Can a density match prove a gold bar is genuine?

It can only argue against it. A sample of 193.2 g and 10 cm³ returns 19.3200 g/cm³ and triggers the gold hint, but alloys and plated fakes can be built to hit the same figure, and a 10 cm³ volume measured by water displacement is only as precise as your cylinder. A mismatch is more informative than a match.

How do temperature and purity affect the answer?

Most materials expand when warm, so the same mass occupies more volume and the density drops. Water is the familiar example, at its densest near 4°C. Alloys, wood moisture and air pockets in powders all shift the figure. The tool calculates from your numbers and cannot correct for any of these.

Will it work for gases?

Mathematically yes, but the units become awkward. 1 g of a gas occupying 833.3333 cm³ has a density of 0.0012 g/cm³, which the tool shows as 1.20 kg/m³, roughly the figure for air at room conditions. Small densities lose precision in the 4-decimal g/cm³ line, so read the kg/m³ row instead.