It's 3/4 of your actual weigh
A person would sit on a chair without falling threw by having a seat on it and if there isn't too much weight on it.
When you sit, the weight of your body is distributed between your buttocks and the chair you are sitting on. The amount of weight on each varies depending on your posture and how you distribute your weight while sitting. On average, when sitting, about 60-80% of a person's body weight is typically supported by the chair.
The chair is pushing up with a force equal to your weight.
When you sit in a chair, the action force is the downward force you exert on the chair due to your weight. The reaction force is the upward force exerted by the chair on you, supporting your weight and keeping you from falling to the ground.
A glass chair is not practical for sitting because it is fragile and could easily break under the weight of a person. Glass is not a strong material for supporting weight, making it unsafe and impractical for use as a chair.
"Would you like to sit on the chair with me, dog?" is a question asking if the person wants to share the chair with a dog.
If your feet are off of the floor, then the chair exerts your total weight against you.
The action force when you sit down on a chair is the force exerted by you on the chair. This force is equal in magnitude and opposite in direction to the reaction force exerted by the chair on you, which supports your weight and keeps you from falling through the chair.
A glass chair would likely break under the weight and pressure of a person sitting on it, as glass is brittle and not designed to support heavy loads like furniture made from traditional materials. It lacks the necessary structural integrity to safely hold a person's weight.
You don't fall out of your chair when you sit down because of gravity. When you sit, your weight creates a force that is balanced by the supporting force from the chair. This balance of forces keeps you in place and prevents you from falling.
Threaten violence as the only alternative.
Comfort, weight allowance, purpose and time you intend to sit.