質しつ量りょう

し

つ

りょ

う

Common wordJLPTN1Freq.FrequencyTop 10,000

Meanings

1

Physics term for mass, as distinct from weight. Used in scientific and technical contexts.

よっ

て

変か

わら

ない

。

The mass of an object does not change depending on location.

2

quality and quantity

Refers to both the quality and the quantity of something, often used in set phrases like 質量ともに (in both quality and quantity).

〈物もの〉の質しつ量りょうを測はかるto measure the mass of something
この物ぶっ体たいの質しつ量りょうを測はかる。
We measure the mass of this object.
質しつ量りょうが大おおきいto have a large mass
地ち球きゅうは月つきより質しつ量りょうが大おおきい。
The Earth has a greater mass than the Moon.

重おもさN1sense 1
重さ (weight) depends on gravity and changes with location, while 質量 (mass) is an intrinsic, unchanging property of matter.
品ひん質しつN2sense 2
品質 refers only to the quality of something, while 質量 in this sense covers both quality and quantity together, as in 質量ともに.
重じゅう量りょうN2
質量 is the physics term for mass, which is distinct from 重量 (weight), the force exerted due to gravity, though the two are often confused in everyday speech.

Compound of 質 (quality, substance) and 量 (quantity). The physics sense is a modern calque from Western science.

invariant mass

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