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Reader questions and feedback on physical science. Also refer to physics, chemistry, astronomy, electricity, magnetism, electromagnet, light, sound, waves, forces, work, energy, friction, heat, thermodynamics, Ron Kurtus, School for Champions. Copyright © Restrictions Answers to Readers' Questions on Physical Science:TemperatureThe following 38 comments and questions have been sent in. They are listed according to date. List of first 10 items
Defining temperature in a solid with no motion of atomsQuestionApril 28, 2009 how can we define teperature in case of solid where there is no translational motion of atom or molecules at all ? javed - Pakistan 17668 AnswerEven though the atoms or molecules in a solid are kept in place by a crystal matrix, such that there is no translational motion, the atoms still vibrate in place. This gives them their kinetic energy. The only time there is no emotion at all is at Absolute Zero. Temperature of box in sunlightQuestionNovember 12, 2007 1- What would be the temperature of a grey closed metalic box placed in direct sunlight? Marcel - France 14765 AnswerIt is impossible to determine the temperature without knowing the exact color, the size of the box and type of materials involved. Grey is a vague color. You need to know the absorption and reflection coefficients. A copper box would affect the temperature different than a steel box. Lowering the temperature of burning materialQuestionNovember 7, 2007 Firefighters find that the temp of burning material is best lowered when water is ? rabeel - USA 14729 AnswerWhen the water is... cold or sprayed on the fire. Thermal expansion for gasolineQuestionApril 10, 2007 HI !! i want to know about the coefficent of thermal expansion for gasoline and other refined petroleum products Amir - Pakistan 13529 AnswerSee http://www.ac.wwu.edu/~vawter/PhysicsNet/Topics/Thermal/ThermExpan.html for a list of coefficient of thermal expansion for various materials. Can a refrigerator be used to cool the house?QuestionFebruary 2, 2007 If we open the door of a refrigerator in summer, will it cool the whole house? Why? - China 13038 AnswerThe refrigerating pump cools the air inside the refrigerator, but it also blows out warm air as part of the cooling process. Feel near the bottom or at the back of a refrigerator when it is running, and you will feel the warm air. Why do some materials shrink when heated?QuestionNovember 5, 2006 Most things expand under heat, what types of materials shrink under heat and why? I'm wondering the science on heat shrink tubes and hoses. Thanks. Garrett - USA 12314 AnswerA solid material that has water molecules suspended in it may shrink when heated as the water is expelled. It essentially shrivels up. Also, some materials undergo a chemical change that causes them to shrink when heated. What affects a helium balloon?QuestionApril 11, 2006 What affects a helium balloon and makes it lose its floatation -- temperature, amount of helium, etc? Why? - USA 10815 AnswerHelium leaks out of a balloon because its atoms are smaller than air molecules. Adding helium to a balloon will make it rise faster, but it will also leak out faster. Which type of ball will lose air quicker in the sun?QuestionApril 10, 2006 I'm doing a science project. Which type of ball will lose air quicker if left outside in the sun, a leather ball (football) or a rubber ball (kick ball)? Why? - USA 10808 AnswerOne factor is the color of the ball. A darker ball will get hotter faster than a light colored ball. A leather ball usually has a rubber inner tube, which is just like a kick ball. But the leather does not expand much, even when heated. Expansion separates the molecules and allows smaller air molecules to escape. So a kick ball would lose air quicker than a leather football. But a rubber white soccer ball probably would lose air even less than the darker football. Experiment thawing out different frozen liquidsQuestionMarch 8, 2006 hi i'm doing an experiment for school, it's freezing differant liquids in bottles and then seeing which defrosts the fastest. do u have nay pointers to make should it runns to plan? marc - Australia 10376 AnswerAll the bottles or containers should be the same size. The same amount of liquid should be in each. It is ideal to do them all at once. You don't need too much liquid in each, otherwise it will take too long for the frozen material to turn to a liquid. Boiling point of apple juiceQuestionFebruary 22, 2006 I am doing a science project on boiling points of several different liguids. I can not find the boiling point of apple juice, and that is one of the liquids which I am using. I was hoping you could tell me what that would be. Thanks! ~L - USA 10189 AnswerThe boiling point of apple juice is greater than pure water and depends on the concentration of apple and sugar. That varies considerably with the type of juice you use. SummaryHopefully, this reader feedback has helped provide information about Science issues. ResourcesThe following are some resources on this topic. WebsitesBooks
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