The world of science is often associated with rapid discoveries, advanced technology, and chemical reactions that occur in a matter of seconds. However, in a corner of a laboratory at the University of Queensland in Brisbane, Australia, exists a physics experiment that moves at the slowest pace in the world. The Pitch Drop Experiment, which began in 1927, holds the Guinness World Record as the longest-running continuous laboratory experiment in human history.
The original purpose of this experiment was very simple yet profound: to prove to students that a substance appearing hard and solid at room temperature is actually a fluid with a very high viscosity. The material used is bitumen pitch, a type of petroleum processing residue so hard that it can be shattered with a hammer blow. Nevertheless, despite its seemingly rigid physical properties, the pitch slowly flows under the force of gravity.
Beginning in 1927: An Experiment Transcending the Timeline
The story of this discovery began when Professor Thomas Parnell, the first head of the physics department at the university, decided to design a unique science demonstration material. He heated a sample of bitumen pitch and poured it into a sealed glass funnel. The material was left to settle and stabilize for three years to ensure no air bubbles were trapped.
In 1930, the bottom of the glass funnel was cut to begin the flow process. From that moment on, the pitch began to form a drop very slowly. The first drop took eight years to form and finally broke off and fell in October 1938. This success proved that the viscosity of pitch is about 230 billion times thicker than ordinary water.
The journey of this experiment continued through decades. The second drop fell in 1947, while the third drop fell in 1962. The long time gap between each drop makes this experiment a phenomenon requiring extraordinary patience from the researchers supervising it.
The most peculiar and amusing thing about this experiment is not the speed of the pitch's flow, but the fate that befell the scientists monitoring it. Although the experiment has run for decades, no human has ever witnessed the moment the drop separates from the funnel and falls live with their own eyes.
Professor John Mainstone, a scientist who took over the task of supervising this experiment for over 50 years, experienced an extraordinary series of bad luck. In 1977, when the seventh drop was expected to fall, he decided to step out briefly to grab a drink and missed the critical moment by just a matter of minutes. In 1988, as the eighth drop formed, he missed it again because he left the laboratory briefly to buy a drink.
Efforts to record this phenomenon using modern technology in the year 2000 also yielded disappointing results. A specially installed webcam to monitor the drop suffered a sudden technical failure precisely at the moment the drop broke off, causing this historic moment to fail to be recorded once again. Only in 2014, through the latest digital camera footage during a beaker replacement process, was the movement of the ninth drop captured for the first time in history.
Environmental Influence and Fluid Physics Discoveries
Aside from luck and time factors, this experiment provides crucial scientific understanding regarding the dynamic properties of extremely viscous fluids. The flow rate of the pitch was found to be heavily influenced by environmental temperature changes. Before an air conditioning system was installed in the laboratory building, pitch drops formed at an average rate of eight to nine years.
However, after the installation of the building temperature control system in the late 1980s, the temperature range became lower and more stable. This caused the drop formation process to become slower, taking between 12 to 13 years for a single drop to form. This discovery provides valuable physical data on how macromolecular substances respond to microclimate variables.
World Recognition and the Philosophy of Scientific Maturity
In 2005, Professor Thomas Parnell and Professor John Mainstone (posthumously) were awarded the Ig Nobel Prize in Physics, an international recognition for research that 'makes people laugh, then think'. This recognition proves that science does not always require cutting-edge equipment worth millions of dollars; instead, thoroughness and continuity are the core essence of knowledge.
Today, the experiment is broadcast live online to allow thousands of science fans from around the world to try their luck at becoming the first human to see the tenth drop fall. This experiment has become a symbol of the immortality of scientific intent transcending a human lifetime, reminding modern society that some secrets of nature require immense time and patience to be fully unraveled.
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Reference: Development of physics experiments reviewed from the philosophy of science — Google Scholar
World's Oldest Science Experiment: The Mystery of the Queensland Pitch Drop That Tests Human Patience. At the University of Queensland, Australia, exists the longest-running laboratory science experiment in human history, which began in 1927. This pitch drop experiment was designed to prove that tar, which appears hard, is actually a fluid with an extremely high viscosity. Uniquely, over the span of nearly a century, various odd incidents have resulted in not a single scientist ever witnessing the drop falling directly with the naked eye.. The world of science is often associated with rapid discoveries, advanced technology, and chemical reactions that occur in a matter of seconds. However, in a corner of a laboratory at the University of Queensland in Brisbane, Australia, exists a physics experiment that moves at the slowest pace in the world. The Pitch Drop Experiment, which began in 1927, holds the Guinness World Record as the longest-running continuous laboratory experiment in human history.
The original purpose of this experiment was very simple yet profound: to prove to students that a substance appearing hard and solid at room temperature is actually a fluid with a very high viscosity. The material used is bitumen pitch, a type of petroleum processing residue so hard that it can be shattered with a hammer blow. Nevertheless, despite its seemingly rigid physical properties, the pitch slowly flows under the force of gravity.
Beginning in 1927: An Experiment Transcending the Timeline
The story of this discovery began when Professor Thomas Parnell, the first head of the physics department at the university, decided to design a unique science demonstration material. He heated a sample of bitumen pitch and poured it into a sealed glass funnel. The material was left to settle and stabilize for three years to ensure no air bubbles were trapped.
In 1930, the bottom of the glass funnel was cut to begin the flow process. From that moment on, the pitch began to form a drop very slowly. The first drop took eight years to form and finally broke off and fell in October 1938. This success proved that the viscosity of pitch is about 230 billion times thicker than ordinary water.
The journey of this experiment continued through decades. The second drop fell in 1947, while the third drop fell in 1962. The long time gap between each drop makes this experiment a phenomenon requiring extraordinary patience from the researchers supervising it.
The most peculiar and amusing thing about this experiment is not the speed of the pitch's flow, but the fate that befell the scientists monitoring it. Although the experiment has run for decades, no human has ever witnessed the moment the drop separates from the funnel and falls live with their own eyes.
Professor John Mainstone, a scientist who took over the task of supervising this experiment for over 50 years, experienced an extraordinary series of bad luck. In 1977, when the seventh drop was expected to fall, he decided to step out briefly to grab a drink and missed the critical moment by just a matter of minutes. In 1988, as the eighth drop formed, he missed it again because he left the laboratory briefly to buy a drink.
Efforts to record this phenomenon using modern technology in the year 2000 also yielded disappointing results. A specially installed webcam to monitor the drop suffered a sudden technical failure precisely at the moment the drop broke off, causing this historic moment to fail to be recorded once again. Only in 2014, through the latest digital camera footage during a beaker replacement process, was the movement of the ninth drop captured for the first time in history.
Environmental Influence and Fluid Physics Discoveries
Aside from luck and time factors, this experiment provides crucial scientific understanding regarding the dynamic properties of extremely viscous fluids. The flow rate of the pitch was found to be heavily influenced by environmental temperature changes. Before an air conditioning system was installed in the laboratory building, pitch drops formed at an average rate of eight to nine years.
However, after the installation of the building temperature control system in the late 1980s, the temperature range became lower and more stable. This caused the drop formation process to become slower, taking between 12 to 13 years for a single drop to form. This discovery provides valuable physical data on how macromolecular substances respond to microclimate variables.
World Recognition and the Philosophy of Scientific Maturity
In 2005, Professor Thomas Parnell and Professor John Mainstone posthumously were awarded the Ig Nobel Prize in Physics, an international recognition for research that 'makes people laugh, then think'. This recognition proves that science does not always require cutting-edge equipment worth millions of dollars; instead, thoroughness and continuity are the core essence of knowledge.
Today, the experiment is broadcast live online to allow thousands of science fans from around the world to try their luck at becoming the first human to see the tenth drop fall. This experiment has become a symbol of the immortality of scientific intent transcending a human lifetime, reminding modern society that some secrets of nature require immense time and patience to be fully unraveled.
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Reference: Development of physics experiments reviewed from the philosophy of science — Google Scholar https://journal.unuha.ac.id/index.php/JIPFRI/article/view/147
