地下鉄

A very small piece or bit of matter, such as a grain of sand, a speck of dust, or a microscopic unit like an atom or molecule. It is commonly used in scientific contexts to describe the fundamental components of a substance or in photography to describe the grain of an image.

Refers to an electron in a scientific context or, more commonly, signifies that something is digital or electronic. It is frequently used as a prefix to describe modern technology replacements for traditional items like books or money.

A neutron is a subatomic particle found in the nucleus of an atom that carries no electric charge. It has a mass slightly larger than that of a proton and is essential for the stability of atomic nuclei.

A substance formed when two or more chemical elements are chemically bonded together. It is used primarily in scientific contexts to describe materials with a fixed ratio of components.

A liquid mixture in which a substance (solute) is uniformly dissolved in another substance (solvent). It is most commonly used in chemistry to describe liquids like salt water or chemical mixtures used in experiments.

A substance, typically a liquid, in which another substance (the solute) is dissolved to form a solution. In a chemical context, it acts as the medium that facilitates the breaking down of particles.

Nitrogen is a colorless, odorless chemical element that makes up about 78 percent of the Earth's atmosphere. It is essential for all living things and is widely used in fertilizers and industrial cooling as liquid nitrogen.

Hydrogen is the simplest and most abundant chemical element in the universe, symbolized by H. In everyday Japanese contexts, it is frequently discussed as a clean energy source used in eco-friendly vehicles and power generation.

A naturally occurring inorganic solid substance with a specific chemical composition and crystalline structure. It is commonly used in scientific contexts to describe rocks, crystals, and ores found in nature.

A volcanic eruption where lava, gas, and ash are ejected from a volcano. It is used to describe both the geological event and the action of a volcano becoming active.