What is Buoyant Force?

kahanacademy.org

This lengthy article discusses the formula behind the Buoyancy Principal.  It plainly states Archimedes Principal as “Every object is buoyed upwards by a force equal to the weight of the fluid the object displaces.”

Water Density

Water Science School – USGS.gov

This article talks about water weighing less the hotter it is.  This happens because water expands when heated and it less dense..

Is a Hot Object Heavier Than a Cold One?

Frank Heile, 2013 – Huffpost.com

In the article the physicist claims and explains why when an bject is heated it weighs more.

How do Ships Float?

In this video a former student at MIT explains how boats float and why they don’t always sink when punctured.  He explains how the boat has the air inside segmented so if one chamber is punctured the boat can still float.