Although carbon dioxide is very injurious to health, both of the substances of which it is composed are necessary to life. 伯莎M.克拉克.科學通論.
For example, if the sun's rays fall upon silver chloride, a chemical action immediately begins, and as a result we have two separate substances, chlorine and silver. 伯莎M.克拉克.科學通論.
The coloring substances are pulverized and the mixture ground. 威廉K.戴維.智者、化學家和偉大醫生的秘密.
Substances which, like an air gap, interfere with the flow of electricity are called non-conductors, or, more commonly, insulators. 伯莎M.克拉克.科學通論.
Can you give any uses of these substances? 伯莎M.克拉克.科學通論.
They insinuated themselves into the substances about them, and the impediments to their progress yielded at their touch. 瑪麗·雪萊.最后一個人.
Commercial soaps are made from a great variety of substances, such as tallow, lard, castor oil, coconut oil, olive oil, etc. 伯莎M.克拉克.科學通論.
What is wanted is a strong, steady current, and our choice of material is limited to the substances which will give this result. 伯莎M.克拉克.科學通論.
Thus by the prism and the blowpipe were the same substances found in the sun, the stars, and the earth. 威廉·亨利·杜利特.世紀發明.
But to avoid taxation it must be rendered unfit for drinking by the addition of such unpalatable substances as wood alcohol, pyridin, benzola, sulphuric ether or animal oil. 佚名.神奇的知識之書.
The hands may gather germs from any substances or objects with which they come in contact; hence the hands should be washed with soap and water, and especially before eating. 伯莎M.克拉克.科學通論.
While soap is, generally speaking, the best cleansing agent, there are occasions when other substances can be used to better advantage. 伯莎M.克拉克.科學通論.
Heat, in general, causes substances to expand or become less dense. 伯莎M.克拉克.科學通論.
In the year 1600, Gilbert, an English physician, enlarged considerably the catalogue of substances which have the property of attracting light bodies. 本杰明·富蘭克林.富蘭克林自傳.
Substances which, like the earth, the human body, and all other moist objects, conduct electricity are conductors. 伯莎M.克拉克.科學通論.
The best kind of gas made from mineral substances is produced by the distillation of a bituminous shale, called Boghead coal, which was discovered a few years since in Scotland. 弗雷德里克·科利爾·貝克維爾.偉大的事實.
They discovered many new substances, such as alcohol,[334] potash, nitrate of silver, corrosive sublimate, and nitric and sulphuric acid. 赫伯特·喬治·威爾斯.世界史綱.
But nowhere, except in the air around us, do we find oxygen free and uncombined with other substances. 伯莎M.克拉克.科學通論.
Many substances besides air stop the flow of electricity. 伯莎M.克拉克.科學通論.
In 1828 Wohler produced urea from inorganic substances, which was the first example of the synthetic production of organic compounds, and it was for many years the only product so formed. Edward W. Byrn.十九世紀發明進展.
Iron, for example, burns when it rusts, because it slowly combines with the oxygen of the air and is transformed into new substances. 伯莎M.克拉克.科學通論.
In filtration, the water is forced through porcelain or other porous substances which allow the passage of water, but which hold back the minute foreign particles suspended in the water. 伯莎M.克拉克.科學通論.
Musical Sounds from Minerals and Other Substances. 威廉·亨利·杜利特.世紀發明.
What is to be learned from this rapid sketch, of the discovery of the radioactive substances, concerning the nature and value of scientific hypothesis? 李貝.西洋科學史.
The principle on which Lithography depends is the different chemical affinities of water for oily and for earthy substances, which cause it to run off from the one and adhere to the other. 弗雷德里克·科利爾·貝克維爾.偉大的事實.
Of those substances, straw has been most successfully applied, and straw paper--excellent to write upon, though not bright in colour--is now made at very low prices. 弗雷德里克·科利爾·貝克維爾.偉大的事實.
Solutions of the compound may be applied to the preservation of all organic substances, either animal or vegetable. 威廉K.戴維.智者、化學家和偉大醫生的秘密.
The substances which make water hard are calcium and magnesium salts. 伯莎M.克拉克.科學通論.
Late improvements in the manufacture of inks are due to the discovery and cheapening of substances which can be used in preparing them. 威廉K.戴維.智者、化學家和偉大醫生的秘密.
The artist and the adaptor have still hardly begun to work with the endless variety of substances now at their disposal. 赫伯特·喬治·威爾斯.世界史綱.