Primary group are the people with whom you are much close. Secondary group is the one with whom you are closer through common goal.
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Explanation:
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In the primary group you get into the sharing of a lasting relationship with other people. For example, family. In the secondary group, you are connected with the people through the common goal and has less personal interactions with them. They are just your co workers.
A primary group is composed of people who you are close with and you personally know them, and you share a meaningful and lasting relationship with one another. An example of this type of group is a family.
A secondary group is a much larger group that you are acquainted with through a common activity<span> or goal. They are the people that you have much less personal interactions except when there are activity gatherings. The example of this is the relationship you have with your co-workers or a club/team.</span>
As the substance melts the particles have a higher chance of colliding with one another and also move much faster than when the substance is solid. This is because the particles have a higher surface area to move around. Also the arrangements of particles are free.
