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: An [[object]] in the [[water]] experiences as lot of [[upthrust]] because [[water]] is [[Density|dense]].
: [[Upthrust]] is weak in the [[air]] because the [[air]] is not very [[Density|dense]]. For most [[object]]s in [[air]] [[upthrust]] can be ignored because it is so small.
: [[Upthrust]] is caused by the [[pressure]] in a [[fluid]]. [[Pressure]] increases with [[depth]] so the bottom of an [[object]] will experience more [[pressure]] than the top. This difference in [[pressure]] results in more a difference between the [[force]] on the bottom than and the top, known as [[upthrust]].
===Examples===
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