The phrase "a heavy form" is correct and usable in written English.
It can be used to describe something that has significant weight or a substantial structure, often in a physical or metaphorical sense.
Example: "The sculpture was made of a heavy form, making it difficult to move without assistance."
Alternatives: "a substantial shape" or "a weighty structure".
However, measurements of 67P showed that its ice has a much higher fraction of deuterium – a heavy form of hydrogen – than water found on Earth.
Measurements from Rosetta's Rosina instrument found that water on comet 67P /Churyumov-Gerasimenko contains about three times more deuterium – a heavy form of hydrogen – than water on Earth.
The neutrons are generated by bombarding a heavy form of hydrogen, called tritium, with a lighter isotope of the gas, called deuterium.
The pipeline would carry a heavy form of oil known as bitumen from oil sands formations in Alberta to refineries in Texas.
In the 17th century the Low Countries popularized a heavy form of cupboard, called in Dutch a kast (or, in the United States, kas), in which the panels were raised and three evenly spaced twisted columns supported a heavy cornice, the whole resting on squat bun (or ball) feet.
The State Department said in a statement that it was ordering a review of alternate routes to avoid the environmentally sensitive Sand Hills region of Nebraska, which would have been put at risk by a rupture of the 1,700-mile 1,700-milearrying a heavy form of crude extracted from oil sands formations in Alberta to refineries in Oklahoma and the Gulf Coast.
For example, most of the oil companies produce a heavier form of gas that requires special refining before it can be transported in the pipeline.
At Sandia National Laboratories in Albuquerque, intense bursts of magnetic fields were used to compress samples of deuterium, a heavier form of hydrogen.
Acting on a hunch that the element hydrogen came in a heavier form, Harold Urey, then a chemistry professor at Columbia, succeeded in separating deuterium from liquid hydrogen in 1931.
If there is less than enough mass, the best that failed star, or brown dwarf, may be able to manage is to produce some heat and light by fusing atoms of deuterium, a heavier form of hydrogen.
Radiocarbon dating measures levels of a heavier form of carbon as it appears in the atmosphere over time and becomes part of plants and, later, the animals that eat them.
