21 grams Experiment

Weight of Human Soul : 21 grams Experiment

On 10th April, 1901, an unusual experiment was conducted by a physicist Duncan MacDougall in Dorchester, Massachusetts. Dr. Duncan MacDougall was a physician from Haverhill, Massachusetts. He was going to prove that the human soul has mass and that is measurable. This experiment was called 21 grams experiment, published in 1907.

Dr. Duncan MacDougall
By this experiment, he proved that human soul has a mass and that is 21 grams.

he conducted this experiment on six dying patients. He attempted to measure the mass lost by a human when the soul leaving the body. MacDougall attempted to measure the mass change of the six patients at the moment of death. His intention was to measure the weight each body before and after death to determine the difference measured by the delicate scales.
The patients were chose based upon their imminent death. Two patients of those six were suffering from tuberculosis. 5 were men and 1 was a woman.

One patient of the six subjects lost three-fourths of an ounce or 21.3 grams of his real weight. But after some seconds the patient got his own real weight.

He carefully measured the weight of his first patient. After dying the patient, which was explained by himself,
"Suddenly, coincident with death, the beam end dropped with an audible stroke hitting against the lower limiting bar and remaining there with no rebound. The loss was ascertained to be three-fourths of an ounce."
                                                                                                            - Dr Duncan MacDougall

Then he continued for the next patient and he got the same result.
“ The instant life ceased the opposite scale pan fell with a suddenness that was astonishing – as if something had been suddenly lifted from the body. Immediately all the usual deductions were made for physical loss of weight, and it was discovered that there was still a full ounce of weight unaccounted for”.
                                                                                 - A quote from New York Times article

Dr. Duncan MacDougall conducted the same experiment on 15 dogs. But in this experiment he got some new result. This experiment showed no change in weight of the dogs.


Dr. Duncan MacDougall concluded that only humans have souls and which has a mass of 21 grams. 

"I believe that in this case, that of a phlegmatic man slow of thought and action, that the soul remained suspended in the body after death, during the minute that elapsed before its freedom. There is no other way of accounting for it, and it is what might be expected to happen in a man of the subject’s temperament."
The average weight loss of each person was 3/4th of an ounce.

Dr. Duncan MacDougall admitted that more research needed to conclude the whole experiment in one line. Unfortunately, he failed to establish any further conclusion of his terrible and crazy experiment.
But after this experiment, it is said that the weight of a human soul is 21 grams. 

SOURCE: https://en.wikipedia.org/wiki/21_grams_experiment


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