A quantity that represents the extent of an area enclosed by a surface in space. The volume of a solid can be measured based on the volume of a cube, but generally must be considered in terms of integration. (1) The volume V of a solid sandwiched between two planes x = a and x = b , whose area when cut by a plane perpendicular to the x -axis is expressed as a function of x , f ( x ), is given by (2) The volume V of the solid formed by rotating the area bounded by the curve y = f ( x ) on the xy plane , the two straight lines x = a , x = b , and the x axis around the x axis is given by (3) In three-dimensional space, the volume V of the region D enclosed by a closed surface can be expressed as follows using Cartesian coordinates: is given by: Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
空間において面によって囲まれた領域の広がりを表わす量。立体の体積は,立方体の体積をもとにしてはかれるが,一般には積分で考えなければならない。 (1) x 軸に垂直な平面による切り口の面積が x の関数 f(x) で表わされるような立体の2平面 x=a ,x=b の間にはさまれた部分の体積 V は,直交座標を用いると で与えられる。 (2) xy 平面上の曲線 y=f(x) と2直線 x=a ,x=b および x 軸に囲まれた部分が,x 軸のまわりに回転してできる回転体の体積 V は である。 (3) 3次元空間において,閉曲面によって囲まれた領域 D の体積 V は,直交座標を用いて で与えられる。 出典 ブリタニカ国際大百科事典 小項目事典ブリタニカ国際大百科事典 小項目事典について 情報 |
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