Due to its being used by physical and biological forces, it is found in the earth, rivers, air and sea but not concentrated in any one environment. From the state of nature it takes extremely sensitive methods to detect the pure metal.
藉著理化與生物等自然力的作用，汞在土壤、河流、空氣、海洋中循環，不會在任何一個環境中特別大量累積，在自然中，需要用極靈敏的方法才能驗測出來。