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A grain of dust typically contains around 1 trillion (1,000,000,000,000) atoms. Dust particles vary in size and composition, leading to different numbers of atoms in each particle.
The movement of a grain of dust in water is due to Brownian motion, where the random collision of water molecules causes the dust particle to move unpredictably. This motion is a result of the thermal energy of the water molecules and is observable on a microscopic scale.
There are approximately 64.8 milligrams in 1 grain.
It is estimated that there are around 1066 atoms in the Milky Way galaxy.
The exact mass of a dust particle can vary greatly depending on its size and composition. On average, a typical indoor dust particle might have a mass on the order of micrograms (10^-6 grams), whereas larger particles like sand grains can have masses on the order of milligrams (10^-3 grams) or more.
There are approximately 1.96 x 10^20 dust particles in 2.45 grams of dust. This is calculated by dividing the total mass of dust by the mass of each particle and converting it to dozens.