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Particle
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Arc welders need to protect themselves from welding sparks, which are heated metal particles that fly off the welding surface.
In the physical sciences, a particle is a small localized object to which can be ascribed several physical or chemical properties such as volume or mass. The word is rather general in meaning, and is refined as needed by various scientific fields. Something that is composed of particles may be referred to as particulate, although this term is generally used to refer to a suspension of unconnected particles, rather than a connected particle aggregation.Whether objects can be considered particles depends on the scale of the context; if an object's own size is small or negligible, or if geometrical properties and structure are irrelevant, then it can often be considered a particle. For example, grains of sand on a beach can be considered particles because the size of one grain of sand (~1 mm) is negligible compared to the beach, and the features of individual grains of sand are usually irrelevant to the problem at hand. However, grains of sand would not be considered particles if compared to buckyballs (~1 nm).
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System
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