In the movie "21 Grams," the title refers to a theory suggesting that the human soul weighs 21 grams. This idea comes from experiments conducted by Dr. Duncan MacDougall in the early 20th century, who claimed to measure the weight loss of dying patients, attributing it to the departure of the soul. The film explores themes of life, death, and the interconnectedness of its characters, emphasizing how their lives are affected by loss and redemption, mirroring the weight of existence and the impact of human connections.

"21 Grams" is a film directed by Alejandro González Iñárritu that explores themes of life, death, and the interconnectedness of human experiences. The title refers to the purported weight of the human soul, suggesting a metaphysical dimension to the narrative. An example of this concept in the film is the intertwining lives of three characters—Jack, Paul, and Cristina—who, after a tragic accident, find their lives irrevocably changed. Their stories illustrate how grief, redemption, and the search for meaning can weigh heavily on the human soul.

The notion that the human body loses 21 grams at the moment of death originates from a controversial early 20th-century study by Dr. Duncan MacDougall, who claimed to measure the weight of souls. However, this claim lacks scientific validity and has been widely discredited. The film "21 Grams" uses this idea metaphorically to explore themes of life, death, and the connections between people, rather than presenting it as a factual statement. In reality, there is no measurable loss of weight associated with the soul.

"21 Grams" is a 2003 drama directed by Alejandro González Iñárritu. The film explores the interconnected lives of three characters: Paul, a terminally ill professor; Jack, an ex-convict seeking redemption; and Cristina, a grieving mother. Their lives collide after a tragic car accident caused by Jack, leading to profound consequences. The title refers to the purported weight of the human soul, symbolizing the emotional and moral weight the characters carry. The narrative unfolds non-linearly, emphasizing themes of loss, redemption, and the search for meaning.