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a fact or principle that is not subject to change.
Avogadro's constant Avogadro's number.


A quantity that, under stated conditions, does not vary with changes in the environment.


/con·stant/ (kon´stint)
1. stable; not subject to change.
2. a quantity that is not subject to change.

association constant  a measure of the extent of a reversible association between two molecular species.
Avogadro's constant  see under number.
binding constant  association c.
Michaelis constant  a constant representing the substrate concentration at which the velocity of an enzyme-catalyzed reaction is half maximal; symbol K M or K m.
sedimentation constant  see under coefficient.


a fact or principle that is not subject to change.


A quantity that, under stated conditions, does not vary with changes in the environment.


a datum, fact or principle that is not subject to change.

Michaelis constant (Km)
a dissociation constant for the substrate concentration in an enzymatic reaction.
constant (C) region

Patient discussion about constant

Q. I have constant pain on my feet more on my bones than anything,do I have arthritis? I do already have plantar fascictis

A. Chronic arthritis is a disease of the elderly and it isn't common to suffer from it in young age, however joint pain or bone pain can be caused by several other reasons, that might not be chronic, such as an infection, excessive physical activity or such. You should see a doctor to evaluate the pain and joint movement. He/ she might send you to do an x-ray to see if there's something they can see that is wrong with the joint or bone (dislocation or fracture).

Q. I have a constant pain in the inside part of my arm. What can it be? In the last few weeks I have noticed that I have a right arm pain. The strange thing is that the pain is in a specific point in the inside part of the arm, very near to the elbow. I thnk the pain started for the first time during a baseball game but I am not sure. I work in a factory and as I sad before I use my right arm for baseball, and this pain hinders me. What can it be?

A. I myself play a lot as a pitcher, and i have the same pain. It is more painful when the forearm is flexed towards the body.
I went to my GP about it because it drove me nuts, and he said that I need to take anti-inflammatory drugs, and if it will not work he will inject me something.
he prescribed me a great medication and I didn't need the injection.

Q. Is it normal for someone with untreated Adult ADHD to have constant, worried thoughts? As a child I was diagnosed with "off the charts" ADHD and took medication which fixed the problem for about 7 years. I ended the medication in junior high and now I am in college. I am no having constant worried thoughts and my mind is always racing. I think this may be the ADHD back now as an adult, would this make sense?

A. Attention Def is often goes hand in hand with Depression. Depression is often missed in diagnosis because the person suggests that they are not sad and don't cry often. Depression might better be described as a feeling of emotional heavyness or pressure without a real reason. This feeling of emotional heavyness is awful and people will try to find reasons to explain why they feel this way so that they can do something about it. Generally, if a person makes a decision about something, such as paying a bill, this heavyness will lift for a while and the person can move on to another thought. When a person is depressed this heavyness is lifted but only for a very short period of time, sometimes only for a few seconds, and the person cannot move on to a new thought. Instead, the tendency is to rethink the same thought over and over to get, although short lived, a bit of emotional releif.

More discussions about constant
References in periodicals archive ?
6), first note that the constant term extraction [U.
Although the fixed-effects model allows for heterogeneity in the constant term and for time variations in the steady-state determinants, thus capturing some of the idiosyncratic features of countries in a better way, the simulated income is still above the observed per capita all along the sample period.
02 Notes: [theta] denotes the estimated coefficients on the MA(1) component of the model, and [micro] is a constant term.
32, are significant at the 5 and 1% levels, and four constant terms are insignificantly different from zero.
Finally, the theme of the estimating procedure revolved around the Grabowski and Baxter [13] R&D rivalry specification using a one period change model without the constant term embedded in a system of equations model.
Unlike the constrained version, the unconstrained model does not restrict the weights to be nonnegative nor sum to one, and the constant term is permitted in the combination equation.
t], then only a constant term should be used; if just a constant is necessary in the test for [y.
Letting the vector X represent some additional explanatory variables including a constant term, the linear DD model appears as follows:
The examples were crafted such that they were in increasing order of complexity: for example, the constant term in the quadratic expression possesses more factors in subsequent examples.
Unlike the usual (q = t =1) scalar product, there is no expression as a constant term for the product [<,>.
dagger]) In this statistical model, the constant term represents the rate of TB by district.

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