Examlex
A dark nebula is a large cloud of dust grains that is so opaque that it blocks any visible light coming from the stars behind it.
Hydrogen Bonding
A type of weak chemical bond that is formed between the hydrogen atom in one molecule and an electronegative atom in another molecule.
Water Molecules
The smallest unit of water (H2O), consisting of two hydrogen atoms covalently bonded to a single oxygen atom, essential for life and all known forms of chemistry.
Charge
The property of matter that causes it to experience a force when placed in an electromagnetic field.
Humidity
A measure of the amount of water vapor present in the air, often expressed as a percentage.
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