Floaty 40mm x 60mm

This is a thing I created recently to prevent a reoccurrence of my friend losing his glasses whilst jet skiing. Basically, he stacked and his glasses sank to the bottom of the ocean! This is a floaty device that he can attach to the strap that holds his glasses on.

Buoyancy is the upward force that an object feels from the water and when compared to the weight of the object. It is what makes an object float, sink, or remain neutrally buoyant in the water.

When an object floats, the upward buoyant force exerted by the water is greater than the downward force of the weight of the object. You can also understand this concept with numbers. If an object’s density is less than water’s density (1 g/cm³), it will float.

Perhaps this is something you could use for a similar situation!

Dimensions are 40mm x 60mm

Cheers
Mark