本文为大家介绍的是一些ACT科学考试重点词汇，大家可以参考一下，在平时备考时要注意词汇的积累与灵活运用。
ACT科学考试重点词汇,ACT科学考试
下面就让小编来为大家介绍一下ACT科学考试重点词汇的相关内容吧，大家要好好把握，希望能够给准备ACT考试的同学带来帮助。
acceleration— The rate that velocity changes per unit time and the direction it changes in. Computed from the change in velocity divided by tire change in time. Common units are meters per second squared (m/s2 )
acceleration due to gravity— The acceleration of an object that is only acted on by the force of the Earth's gravity. This value is given the symbol g and near the surface of the Earth it has a value of approximately 9.8 m/s2. The direction of the acceleration due to gravity is vertically downward.
accuracy— The closeness of an experimental measurement to the accepted or theoretical value.
acid— A substance that is a proton donor. The pH of an acid is less than 7.
analysis— A stage in the scientific method where patterns of observations are made.
antioxidant — any substance that inhibits oxidation, including vitamin E, vitamin C, or beta carotene, and is thought to protect the body from the damaging effects of oxidation
aqueous solution— A solution in which the solvent is water.
arteries— The vascular tissue which carries blood away from the heart.
astronomy— The study of planets, stars, and space.
atom— The smallest structure that has tire properties of an element. Atoms contain positively charged protons and uncharged neutrons in the nucleus. Negatively charged electrons orbit around the nucleus.
ATP— (Adenosine Triphosphate.)—A chemical that is considered to be the "fuel" or energy source for an organism.
atria— The chambers of the heart that receive blood.
base— A substance that is a proton acceptor. The pH of a base is greater than 7.
bacteria— one-celled organisms that are involved in fermentation, putrefaction, and infectious diseases
calibration—The examination of the performance of an instrument in an experiment whose outcomes are known, for the purpose of accounting for the inaccuracies inherent in the instrument in future experiments whose outcomes are not known.
capillaries— Vascular tissue that receives blood from the arterioles and releases the blood to the venules.
catalyst— An agent that changes the rate of a reaction, without itself being altered by the reaction.
celestial equator— The extension of the Earth's equator out onto the celestial sphere.
celestial poles— Tire extension of the Earth's north and south pole onto the celestial sphere.
celestial sphere— The imaginary sphere onto which all the stars are viewed as being on for the purposes of locating them.
cell membrane— An organelle found in all cells that acts as the passageway through which materials can pass in and out. This organelle is highly selectively permeable, only allowing materials to pass through that it "chooses" chemically.
cell wall— An organelle found primarily in plant cells and fungi cells, and also some bacteria. The cell wall is a strong structure that provides protection, support, and allows materials to pass in and out without being selectively permeable.
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