Difficulty: Hard

Average Score: 35%

Read the brief passage about heat.
After Benjamin Franklin argued that electricity was a fluid, the scientific community started discussing other phenomena as being related to fluids. In 1787, Lavoisier developed the idea that heat was an invisible fluid called a caloric fluid. This fluid would leave a hot substance and travel to a colder substance.
Later, in 1783, Lavoisier demonstrated that oxygen was required for combustion. In 1798, Count Rumford observed that the process of boring out cannons from brass cylinders continuously produced heat. He also found the brass filings produced from the drilling process contained enough heat to boil water while retaining their weight.
In the early 1940s, James Joule discovered that heat could be produced by moving a wire through a magnetic field.

Which statement from the passage refutes Lavoisier's idea that heat is a fluid that leaves a hot substance and travels to a colder substance?

Rationale

He also found the brass filings produced from the drilling process contained enough heat to boil water while retaining their weight.

This statement demonstrates that heat is not a fluid that leaves a hot substance, as it implies that heat is produced through mechanical means without any loss of mass in the material. Thus, it contradicts Lavoisier's notion of heat as a fluid transferring from hot to cold objects.

A (He also found the brass filings produced from the drilling process contained enough heat to boil water while retaining their weight.) CORRECT

This statement supports the idea that heat can be generated through mechanical work without the transfer of a fluid, directly challenging Lavoisier's concept of heat as a fluid that moves from one object to another. It shows that heat can be created while the mass of the brass remains unchanged.

B (James Joule discovered that heat could be produced by moving a wire through a magnetic field.) YOUR ANSWER

While this statement discusses the production of heat through mechanical means, it does not specifically refute Lavoisier's idea about heat as a fluid. It illustrates an additional method of heat generation, but does not negate the fluid concept directly.

C (Lavoisier demonstrated that oxygen was required for combustion.) YOUR ANSWER

This statement pertains to the role of oxygen in combustion but does not address or refute the concept of heat as a fluid. It is relevant to discussions of combustion but not to the fundamental nature of heat itself.

D (Count Rumford observed that the process of boring out cannons from brass cylinders continuously produced heat.) YOUR ANSWER

Although this observation indicates that heat can be produced through mechanical work, it does not explicitly counter Lavoisier's notion of heat as a fluid. It suggests a method of heat generation but does not explicitly refute the fluid concept.

Conclusion

The statement regarding brass filings effectively contradicts Lavoisier's idea of heat as a fluid by demonstrating that heat can be produced through mechanical processes without mass loss. In contrast, the other statements either support different aspects of thermodynamics or do not directly challenge Lavoisier's theory, highlighting the significance of mechanical work in heat generation.

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