The volume of any solid, liquid, plasma, vacuum or theoretical object is how much three-dimensional space it occupies, often quantified numerically. One-dimensional figures (such as lines) and two-dimensional shapes (such as squares) are assigned zero volume in the three-dimensional space. Volume is commonly presented in units such as mL or cm3 (milliliters or cubic centimeters).
Volumes of some simple shapes, such as regular, straight-edged and circular shapes can be easily calculated using arithmetic formulas. More complicated shapes can be calculated by integral calculus if a formula exists for its boundary. The volume of any shape can be determined by displacement.
Related terms Edit
Volume and capacity are sometimes distinguished, with capacity being used for how much a container can hold (with contents measured commonly in liters or its derived units), and volume being how much space an object displaces (commonly measured in cubic meters or its derived units).
Volume and capacity are also distinguished in a capacity management setting, where capacity is defined as volume over a specified time period.
Traditional cooking measures Edit
|teaspoon||1/6 U.S. fluid ounce (about 4.929 mL)||1/6 Imperial fluid ounce (about 4.736 mL)||5 mL|
|tablespoon = 3 teaspoons||½ U.S. fluid ounce (about 14.79 mL)||½ Imperial fluid ounce (about 14.21 mL)||15 mL|
|cup||8 U.S. fluid ounces or ½ U.S. liquid pint (about 237 mL)||8 Imperial fluid ounces or 2/5 fluid pint (about 227 mL)||250 mL|
In the UK, a tablespoon can also be five fluidrams (about 17.76 mL).
Volume formulas Edit
|A cube||a = length of any side (or edge)|
|A rectangular prism:||l = length, w = width, h = height|
|A cylinder:||r = radius of circular face, h = height|
|A general prism:||B = area of the base, h = height|
|A sphere:||r = radius of sphere|
which is the integral of the Surface Area of a sphere
|An ellipsoid:||a, b, c = semi-axes of ellipsoid|
|A pyramid:||A = area of the base, h = height of pyramid|
|A cone (circular-based pyramid):||r = radius of circle at base, h = distance from base to tip|
|Any figure (calculus required)||h = any dimension of the figure, A(h) = area of the cross-sections perpendicular to h described as a function of the position along h. This will work for any figure if its cross-sectional area can be determined from h (no matter if the prism is slanted or the cross-sections change shape)</small>.|
The units of volume depend on the units of length. If the lengths are in meters, the volume will be in cubic meters.
Volume formula derivation Edit
The radius of the circular slabs is
The surface area of the circular slab is .
The volume of the sphere can be calculated as
This formula can be derived more quickly using the formula for the sphere's surface area, which is . The volume of the sphere consists of layers of infinitesimal spherical slabs, and the sphere volume is equal to
The radius of each circular slab is , and varying linearly in between -- that is,
The surface area of the circular slab is then
The volume of the cone can then be calculated as
And after extraction of the constants:
Integrating gives us
See also Edit
- Conversion of units
- Dimensional weight
- Orders of magnitude (volume)
- Volume form
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