𝒑 = 𝒎 / 𝙫

## What is Density?

Density is a measure of the mass per unit of volume of a substance or object. It is typically expressed in units of kilograms per cubic meter (kg/m^3) or grams per cubic centimeter (g/cm^3). The density of a substance can affect its physical properties, such as how it behaves when placed in a liquid or when subjected to pressure.

## How do you calculate density?

Density can be calculated using the following formula:

density = mass ÷ volume

Where:

mass is the total amount of matter in an object, usually measured in kilograms or grams volume is the amount of space occupied by the object, usually measured in cubic meters or cubic centimeters. For example, if an object has a mass of 10 kilograms and a volume of 5 cubic meters, the density would be:

density = 10 kg ÷ 5 m^{3} = 2 kg/m^{3}

## What is the density of water?

The density of water is approximately **1 g/cm³** (gram per cubic centimeter) or **1 g/mL** (gram per milliliter) at standard temperature and pressure (STP). The exact density of water depends on the temperature and pressure conditions, but the value of 1 g/cm³ or 1 g/mL is often used as a reference point.

## What is the density of air?

The density of air varies with temperature, pressure, and humidity. At sea level and standard temperature (15°C or 59°F), the average density of air is approximately **1.2 kg/m³** (kilograms per cubic meter) or **0.0012 g/cm³** (grams per cubic centimeter). However, it’s worth noting that this is an average value and the actual density of air can vary depending on the conditions.

## Example Calculation

Density is defined as mass per unit volume.

**Here’s an example calculation:**

Suppose we have a block of aluminum with a mass of 40 grams and a volume of 8 cubic centimeters. To find its density, we divide the mass by the volume:

density = mass / volume density =** 40 g / 8 cc** density = **5 g/cc**

So, the **density of the aluminum block is 5 g/cc.**

## What is the density of copper?

The density of copper is** 8,960 kg/m³** (kilograms per cubic meter) or** 8.96 g/cm³** (grams per cubic centimeter). This value is considered to be its standard density, and it is based on its physical properties at room temperature and pressure. It’s worth noting that the density of copper can be affected by temperature and pressure, so it may vary slightly from this standard value under different conditions.

## What is the density of ethanol?

The density of ethanol (C2H5OH), also known as ethyl alcohol, is **789 kg/m³** (kilograms per cubic meter) or **0.789 g/cm³** (grams per cubic centimeter) at 20°C (68°F). It’s worth noting that the density of ethanol can vary with temperature and pressure, so the value may be different under different conditions.