It sounds like you are already involved with someone, and now you find yourself attracted to someone new?

Chemistry is always highest in the beginning and it slowly declines. I think it is very likely you will meet many people with whom you have a stronger "chemistry" than your long-term partner. You don't have to act on it, and if you are committed to your partner, just walk away.

I agree that chemistry is the beginning of a relationship and in less many other things fall into place it doesn't last...

If you are in a good relationship but part of it is something that requires some work then I would make an effort in those areas before giving into something due to an attraction that may be over with after a date

For me, there has to be chemistry or I don't see the point. It's extremely important. And because of that, it's really upsetting when I meet someone who does have a lot in common but the chemistry isn't there. To me, that'd be like dating a brother or something. There's been a couple times in my life where I tried to force myself to date someone that I didn't have any chemistry with because I thought they were a good catch. It ended VERY badly. But on the flip side, there's been time when I've had chemistry with people I know are no good for me (don't have the same ambitions and moral character as myself).

Define "chemistry". If by chemistry you mean similar eccentricities and sense of humor, where you get and are laughing at each other's sense of humor, and hopefully you both HAVE a sense of humor, pretty important I think! And yes I've experienced those "sparks", usually at work. Unfortunately my own tiredness, from work, and negativity got in the way.

Jokes I meant.

Agree, depends on your definition. Based on my definition, it's everything.

If by "chemistry" you mean attraction, I think it's important to have this. If you find yourself with someone who it makes logical sense to be with, but are emotionally unable to fully commit to the relationship because you are not attracted, it won't end well. Relationships are hard enough to make work when attraction is there. I once dated a girl whom I was not attracted to. She liked me, and I liked her on the surface, but I couldn't get past the head/heart conflict and ended up hurting her pretty badly. If you walk into a crowded room there will be some people you are initially attracted to and some that don't catch your eye. Some of those people could, given time and emotional connection, become attractive to you. But some never will. That being said, chemistry is only one of several important components required for a successful relationship. Shared goals and values, reciprocated feelings, emotional stability and availability are important, too. Chemistry may bring two people together, but loyalty and commitment are far more important in the long run.

I just read a whole bunch of stuff about this because I am trying to evaluate my own attraction....
Not only there are different levels of attraction and how it begins and unfolds, but another variable Is also what YOU want from a relationship and where you are as a person when it comes to trust, openness, etc.

Thanks for the input their is much to consider, Its important to me because I don't want to go into a relationship blindly and suffer the consequences.

I don't really know your situation, but you may be overthinking it a bit. If you like someone and want to be with them, and they want to be with you,what else is there? Sure there may be finer details, but otherwise, every relationship starts somewhere and it's usually with a mutual attraction, whether that be physical, mental, emotional, etc.

I think it is very important....I just started seeing a guy and so far I have NO chemistry toward him, I will give it a bit longer and if it doesn't develop I will move on.

In my dating experience in my 50s, and in the experience of my female friends and family, men at this age have tended to both seem very happy and claim to be very happy in current relationships, but they're also always looking over the current woman's shoulder just in case' there's something a weensy bit even better over there. Chasing the Butterfly, the perfect woman for him. It's a sort of syndrome and it never ends well. I've dumped two men for that and both of them have come back on a regular basis over the years, like bad pennies, time and again, asking for another chance. One of them just showed up again this month, talking about how much he missed me and could he take me to dinner. I have better things to do. 'Chemistry' is just another excuse for looking over her shoulder (the woman a man is currently with) 'just in case' the perfect woman is over there somewhere looking back. If a man isn't happy enough with who he is with, he needs to stop holding her back, let go. If a man wants to shop around, end the current relationship before even beginning to explore another. Anything else is disrespectful and is a waste of the current gal's time when she could be free to find someone who considers her just right for him. Don't be that typical guy who wants to have his cake and eat it, too.