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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 ?
The evil invariable operates independently, after originally being taken to use, it is reiterated from publication to publication, research to research, and its size is for a long time unchanged.
It is an invariable principle that men labor in order to satisfy their desires or that the motive power of production is the prospect of consumption.
The author played college ball and this book has a recommendation by Rick Fox, from the LA Lakers, who says it is "truly authentic in its examination of both the game I love and the invariable missteps toward manhood.
Few who have watched television pictures of climbers in the Himalayas can have anything but the utmost respect for the resilience of the Nepalese porters who invariable accompany such expeditions.
The test kit detects antibodies directed against an invariable region (I[R.
Subjects marked a two-inch circle on a palm as an invariable testing zone.
Paek ''mentioned the DPRK's invariable stand to maintain the ultimate goal of making the Korean Peninsula nuclear-free and resolve the nuclear issue peacefully,'' in a meeting in Jakarta with Indonesian President Megawati Sukarnoputri, the statement said.
She's like Wittgenstein's lunch, utterly invariable,
We know it is destructive of health and well-being to experience conditions that are invariable, yet we carry on with deep plans and heavy servicing based on these mistaken assumptions about presumed conditions of comfort.
This volume of conference proceedings edited by Alain Montandon aims to acknowledge the fundamentally invariable elements of the conte while uncovering and analysing the multiple forms and various meanings which different historical and geographical cultures and contexts bestow upon their own contes.
Makes you long for the days of innocence when to the graffiti ``My mother made me a homosexual'' the invariable scrawled response was ``If I send her the wool will she make me one, too?
But they are an invariable whenever Stourbridge meet Esher.