what is the meaning of a variable in science?
928401
A variable is something that changes. In a science project, the independent variable is the thing you are changing. For example, if you are experimenting on the growth of plants with different types of liquids (like water, orange juice, whatever), the independent variable would be the liquid you feed the plant. The dependent variable in the same experiment would be the growth of each plant. The dependent variable is always something you can measure (temperature, height, mass, etc.)
799409
My biology teacher taught it as the Independent variable being the thing I control. The I in independent with the I in I helps me remember.\n\nAnd then the dependent variable depends on the independent. It's the thing you're looking for the change in.
157437
It is a 7 letter word.\n\n#\n\n   1. The observation, identification, description, experimental investigation, and theoretical explanation of phenomena.\n   2. Such activities restricted to a class of natural phenomena.\n   3. Such activities applied to an object of inquiry or study.\n\n# Methodological activity, discipline, or study: I've got packing a suitcase down to a science.\n# An activity that appears to require study and method: the science of purchasing.\n# Knowledge, especially that gained through experience.
1116002
partial differential equation (PDE) is a relation involving an unknown function of several independent variables and its partial derivatives with respect to those variables. Partial differential equations are used to formulate and solve problems that involve unknown functions of several variables, such as the propagation of sound or heat, electrostatics, electrodynamics, fluid flow, elasticity, or more generally any process that is distributed in space, or distributed in space and time. Very different physical problems may have identical mathematical formulations.
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"Science is anything that can be written down recorded and set a data."\n\nHere's a tip for you: Whenever you need to redefine a word to prove a point, you are WRONG. Redefining the word does NOT make you correct, it shows everyone with half a brain how wrong you are, and that you know yourself that you're wrong, right off the bat.
32562
In a scientific experiment, the independent variable is the variable you manipulate--the one over which you have some degree of control (some people call these explanatory variables). For example, suppose you want to know whether caffeine causes headaches. You'd get a bunch of people, divide them into groups, and give each group a different dose of caffeine; then, some time later, you'd ask them how much their head hurts. In this case, caffeine is the independent variable, and headache is the dependent variable.\n\nMore complicated experiments can involve multiple independent variables and multiple combinations thereof. Let's say you want to do the reverse of the above study--you want to compare two drugs that alleviate headache. You'd get three groups and give each group a different dose of Drug 1; then you'd get another three groups and give each one a different dose of Drug 2. Then you could see which drug has the best effect at a particular dose, which drug has the best effect overall, and so on. You could also give another set of people both drugs, which would allow you to see if the combination had an additive effect or no effect at all. Studies like these get complicated and expensive: if you have two drugs and three possible doses per drug, you need six groups of subjects; if you want to test all possible combinations as well, you need another nine groups.\n\nTypically, you also want to include a control group in which subjects do not receive the independent variable at all (so now you have a sixteenth group in the second study). In the headache study, you'd want one group that didn't receive any drugs at all (or more properly a placebo). Here's why: suppose 5 of your control subjects reported that their headaches went away. Now suppose 5 of your subjects on the lowest dose of Drug 1 get better. Well, that's the same number as in the control condition, so as far as you can tell, giving the low dose of Drug 1 is no better than giving no drug at all; you would have to conclude that the low dose of Drug 1 had no detectable effect.\n\nAlso, in studies like these, you usually want to use a double-blind design and a placebo control so that the placebo effect doesn't give you misleading results.
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It's probably just a variable (or a letter that represents a number).
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Quit thinking x and y and start thinking independent variable and dependent variable, or independent variable and function result.\n\n\nAll you care about is that the independent variable is along the abcissa, and the dependent variable is along the ordinate.\n\nThat said, just pretend that the y in your equation is x for the TI and the x in your equation is the y for the TI.
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the plain truth is variable\nmy truth not necessary to be your truth
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A variable is something that changes.\n\nA control is the thing in your experiment that helps show that tehre are no flaws in it.\n\nCurrently, I'm doing an experiment on the effect of color on a child's brain to follow directions. In this experiment, I give 40 children the same exact test buttt the sheet of paper's color whcih it is printed on changes.\n\nThe variable of this experiment is the different colored pieces of paper\n\nThe control would be the classroom I test it in (do the experiment in the same class each time) and the WHITE piece of paper which will show that there IS an effect.
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Did you mean stochastic? It's a random variable quantity.
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im not sure if that first answer was clear so...........\nAnything in the emperiment that you have control for.  for example say you are testing how fast water boils at a certain temperature.  the temperature is the controlled variable because you can change the temperature yourself by increasing or decreasing the heat... the controlled variable is independent.  If you had to make a chart or graph, it would be on the x axis...  im not sure if thats any clearer
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A discrete variable typically fits into a category and is a yes or no answer.  They are tabulated into single events, i.e. broken = yes or no?.\n\nA continuous variable is something measured on a continuum, and can have an infinite number of values.\n\nA good test for this is to ask if it can be divided in half.  For example, Can something be half broken?  If is doesn't make sense to be, it is discrete.
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"Direct variation" is one of those math topics that's easier to "show" than to "tell" -- although I will try my best to do both for you.\n\nTwo variables (let's call them X and Y) "vary directly" if they are related in the following way:  When the value of one increases, so does the other's.  This is also called "direct proportionality" or "the quantities are directly proportional."\n\nAs a mathematical relationship, this arrangement can be written:\n\nY = cX\n\nwhere 'c' is understood to be some constant.  If the problem reveals the value of 'c' -- for example, we read "Y is double X" -- we could substitute that value in place of the variable 'c':\n\nY = 2X\n\nOnce the "specific" relationship is known, it's simple to figure out one variable just by knowing the other.  Suppose X=4.  What is Y?\n\nY = 2(4)\nY = 8\n\nWhen is this property used?  All the time!  Suppose the manager of a store always earns three times the salary that a cashier does.\n\nM = 3C\n\nWe could use this relationship to calculate what the cashier earns, once we are told that the manager earns, say, $48,000 per year.\n\n48000 = 3C\n\nDivide by 3:\n\nC = 16000\n\nThe cashier earns $16,000 per year.\n\nDirect variation is just one of several types of mathematical connection between two quantities (others include "inverse variation," "exponential variation," etc.).\n\nGood luck, and hope this helps!
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Two variables are independent if the value of one is not affected when the other is changed. For example,\nIf you have a rectangle, you can change the height without affecting the width, so height and width are independent variables. But, if you keep the height fixed, and change the width, the area of the rectangle will change, so the area and width are dependent variables.\n\nI am going to assuming that you know what an ordinary derivative is. To take a partial derivative, you start with a function of two or more independent variables. You treat all but one of the variables as if they were constants, and then take the derivative with respect that variable.\n\nFor example, if f(x, y) = 6x + 10xy + 12y\nthen to take the partial of f with respect to x, you treat y as if it were a constant and take the derivative with respect to x which gives you \n\n6x + 10y\n\nTo take the partial of f with respect to y, you treat x as if it were a constant, and differentiate\nit as a function of y and get\n\n10x + 12
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phys·ics (fĭz'ĭks) \nn.\n(used with a sing. verb) The science of matter and energy and of interactions between the two, grouped in traditional fields such as acoustics, optics, mechanics, thermodynamics, and electromagnetism, as well as in modern extensions including atomic and nuclear physics, cryogenics, solid-state physics, particle physics, and plasma physics.\n(used with a pl. verb) Physical properties, interactions, processes, or laws: the physics of supersonic flight.\n(used with a sing. verb) Archaic. The study of the natural or material world and phenomena; natural philosophy.
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No, it's an independant variable (in the sense that it's not a linear combination of other variables such as length, mass, or charge) and, since it's linearly independant, it can be used as a dimension (or one of the spanning vectors) in a vector space.\n\n\nDoug