"From 'Ta Physika' to Contemporary Physics – A Historical Summary (Part XXXII)"

“From ‘Ta Physika’ to Contemporary Physics – A Historical Summary (Part XXXII)”


### The Renaissance Influence on Hydrostatics and the Revival of Archimedes’ Contributions

The renewed enthusiasm for the natural sciences throughout the European Renaissance prompted a revival in the exploration of classical mathematical and scientific literature from ancient times—most notably the works of the Greek mathematician Archimedes. Among his many noteworthy contributions to geometry and mechanics, Archimedes’ treatise *On Floating Bodies* played a particularly crucial role, igniting advancements in both physics and hydrostatics during the sixteenth and seventeenth centuries. By delving into this lesser-known work, Renaissance intellects like Benedetti (1530–1590), Stevin (1548–1620), and Galileo (1564–1642) were able to question and ultimately replace entrenched Aristotelian concepts regarding motion and buoyancy, establishing a foundation for contemporary dynamics and fluid mechanics.

### Archimedes’ *On Floating Bodies*

Archimedes’ *On Floating Bodies* is structured in two books, providing insights both theoretical and practical regarding hydrostatics—an area that was initially not widely explored in the Western tradition. While medieval scholars predominantly engaged with Aristotle’s overarching cosmological ideas, Renaissance thinkers gravitated toward Archimedes due to the ascent of empirical scrutiny and experimentation.

In *Book I*, Archimedes discusses essential concepts related to fluids, presenting innovative thoughts on fluid pressure and equilibrium. His explanation, albeit somewhat intricate, was groundbreaking for its era:

> “Let it be agreed that the fluid is of such a character that of the components of it which are at the same level and next to one another, that which is pressed less is pushed away by that which is pressed more, and that each part is acted upon by the fluid that is directly above it, provided the fluid is free from confinement and not compressed by any other means.”

From these insights, Archimedes articulates what is now famously recognized as the “Principle of Archimedes,” asserting:

> “Solids that are denser than the fluid, when immersed in the fluid, will be forced downwards as far as they can descend, and they will appear lighter [when measured] in the fluid [than in air] by the weight of the quantity of fluid equivalent in volume to the solid.”

This principle, which is often rendered in simpler terms today, indicates that any object fully or partially submerged in a fluid experiences an upward buoyant force equivalent to the weight of the fluid it displaces. Additionally, Archimedes discerned that the volume of the displaced fluid perfectly matches the volume of the submerged object, a realization that had significant implications for understanding buoyancy and fluid displacement, famously culminating in the “Eureka!” moment.

*Book II* of *On Floating Bodies* provided an exhaustive geometric and hydrostatic examination of floating right paraboloids and their varied equilibrium states in denser fluids. Though highly specialized, Archimedes’ exploration of paraboloidal shapes likely refined the understanding of ship hulls, offering valuable insights into stability and balance—essential aspects for shipbuilding and naval engineering.

### Renaissance Rediscovery and Translation

Following a prolonged interval during which Archimedes’ hydrostatic contributions were either overlooked or eclipsed by Aristotelian views, the Renaissance witnessed a renewed fascination with his studies, aided by the efforts of translators and commentators like Niccolò Tartaglia (1499–1557). Tartaglia made Archimedes’ works available by releasing a Latin translation of *On Floating Bodies*, initially in 1543, succeeded by an Italian edition. Federico Commandino (1509–1575), a prominent mathematician and an Archimedes expert, identified inaccuracies in the Tartaglia translation and enhanced it, publishing his revised Latin edition in 1565, which generated additional intellectual interest.

Intellectuals such as Galileo, aiming to develop mathematical laws that govern the motions of falling objects, scrutinized *On Floating Bodies* to formulate empirical and theoretical models that could compete with Aristotle’s physics. These Renaissance scientists increasingly sought predictive and robust models of natural behavior, aligning more with Archimedes than the earlier Aristotelian paradigm.

### The Contributions of Simon Stevin

A particularly prominent figure influenced by Archimedes’ insights in hydrostatics was Simon Stevin (1548–1620), a Dutch polymath. Stevin’s *De Beghinselen des Waterwichts* (The Principles of the Weight of Water), published in 1586, is viewed as the first comprehensive treatise on hydrostatics since Archimedes’ original work. Like Archimedes, Stevin endeavored to comprehend the principles governing buoyancy and fluid pressure.

Stevin’s treatise is comprised of two sections. The first, *The Elements of Hydrostatics*, establishes the theoretical underpinnings of fluid mechanics, while the second unfinished segment, *Preamble to the Practice of Hydrostatics*,