Molecules.
A common molecule in air is O2, or two oxygen atoms stuck together.
A 'particle' is a general term for anything very, very small. A molecule specifically indicates a combination of two of more atoms. Atoms are the smallest things which can exist independently, they come in over 100 different types and all substances are made up of different combinations of atoms.
For example iron is made up of Iron atoms but steel is made of iron atoms with some carbon atoms. Diamond is made of carbon atoms while petrol (gasoline) is made of a combination of carbon and hydrogen atoms.
Water is a molecule made of oxygen and hydrogen.
The air is a mixture of things. Nitrogen gas makes up most of the air, each molecule of nitrogen is made of two nitrogen atoms joined together. Oxygen is another major component of the air and again, each molecule is made of a pair of oxygen atoms.
(Not all things are combined, helium is a gas found in the very highest parts of our atmosphere and is not a molecule but instead exists as individual atoms.)
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Visible particles in the air are called particulate matter. These particles can consist of dust, dirt, soot, smoke, and liquid droplets. They can have a variety of sources, including natural sources like wildfires and volcanic eruptions, as well as human activities like industrial processes and vehicle emissions.
Quarks are the smallest particles of matter
The small particles that make up matter are called atoms. Atoms are known as life's building blocks for this reason.
A mixture with floating particles is called a suspension. Suspensions are a heterogeneous mixture where the particles are large enough to be visible and can settle out over time due to gravity.
Particles of carbon that enter the air when wood and coal are burned are called soot or particulate matter. These tiny particles can contribute to air pollution and have harmful effects on human health and the environment.
It is called a suspension. This type of mixture is not uniform in composition, and the particles will eventually settle out due to gravity.
The particles in smoke that give it its dark color are called soot or particulate matter. These particles are small, solid substances that are suspended in the air.
The visible smoke coming out of a chimney is typically called chimney smoke or chimney emissions. It is produced when a substance is burned in the fireplace or stove and consists of small particles and gases.