In a positive universe positive matter experiences positive repulsive forces from all directions (Figure 21a). When forces from opposite directions balance an object remains suspended in space and weightless. When forces from opposite directions are unequal, an object is pushed by the stronger force towards the weaker force (Figure 21b). A free object moves towards the weaker force while a stationary object gains weight. The difference between opposite forces determines weight, large difference is heavier and small difference is lighter (Figure 21c). So if you heat up matter, introduce negative heat particles, lower the positive charge of an object, you lower the difference between forces acting on the object and its weight. (Rate of fall (g) is determined by the ratio between forces acting on an object).