Glossary term: 質量
Description: 質量是一個物體所含物質的總量。構成物體的原子的數量、類型和密度共同決定了物體的質量。在日常用語中，質量和重量這兩個概念經常被相互替換，但在物理學中，它們其實並不相同。質量在任何位置都保持不變，而重量則取決於當地的引力場。
質量有兩種概念：“引力質量”和“慣性質量”。其中，“慣性質量”是物質抵抗運動狀態變化的特性，它即是牛頓第二定律中的質量。我們看到，加速度與質量成反比。因此，在給定力的作用下，質量越大的物體加速度越小。
“引力質量”則是物質產生並受到引力的特性，質量越大的物體所受到的引力越大。
愛因斯坦通過他的“等效原理”斷言，引力質量和慣性質量是完全相同的。這是物理學中的一個基本概念。
千克（kg）是國際公認的質量計量單位（也可使用其他單位，如克、毫克、噸、盎司和磅），質量用符號m表示。質量是一個標量，並且是一種形式的能量。因此，質量可以在核反應等過程中轉化為其他形式的能量，而且質量並不是嚴格守恆的。自然界中存在無質量的粒子，如光子——攜帶電磁輻射的粒子。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
This is an automated transliteration of the simplified Chinese translation of this term
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