Matter, though divisible in an extreme degree, is nevertheless not infinitely divisible. That is, there must be some point beyond which we cannot go in the division of matter. ... I have chosen the word “atom” to signify these ultimate particles.
Interpretation
Matter has a fundamental limit to its divisibility, known as atoms.
This quote by John Dalton emphasizes the idea that matter is not infinitely divisible and that there are ultimate building blocks, which he refers to as 'atoms'. Dalton's assertion laid the groundwork for the atomic theory, suggesting that all matter is composed of these indivisible particles, fundamentally changing the understanding of chemistry and physics.
In practice
In a science lecture about atomic theory, this quote could illustrate the concept of matter.
No new creation or destruction of matter is within the reach of chemical agency. We might as well attempt to introduce a new planet into the solar system, or to annihilate one already in existence, as to create or destroy a particle of hydrogen.
And I don't care what else anyone has ever told you, the Sun is white, not yellow. Human color perception is a complicated business, but if the Sun were yellow, like a yellow lightbulb, then white stuff such as snow would reflect this light and appear yellow-a snow condition confirmed to happen only near fire hydrants.
Still, it is an error to argue in front of your data. You find yourself insensibly twisting them round to fit your theories.
To the field of synthetic chemistry belongs an array of responsibilities which are crucial for the future of mankind, not only with regard to the health and needs of our society, but also for the attainment of a deep understanding of matter, chemical change, and life.
Water is the key to dealing with the twin challenges of poverty and growth.
Finally we shall place the Sun himself at the center of the Universe.
The first footfalls on Mars will mark a historic milestone, an enterprise that requires human tenacity matched with technology to anchor ourselves on another world.
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