Sounds just like frozen piping
If it is coming from the tank: NO. If it coming from the bowl: YES!
2" or 3" integral trap built into toilet bowl.
clay used in making the porcelain bowl or the trace minerals that are in the water in the toilet bow.
YOU DON'TIt is pre determined by the seal of the trapBasically when the toilet is designed the volume of retained water at the bottom of the toilet is calculated so that it stops effluent gasses coming back up the stench pipe in to the toilet and also to stop waste that goes down sticking to the bottom of the bowl.
Not the bowl, the tank
You would need to pour the water into the bowl.
No, the water in a toilet does not spin one way in the northern hemisphere and spin the opposite direction in the southern hemisphere. The spin of the water in a toilet is determined by the shape of the toilet bowl and the flush system, not by the direction of the Earth's rotation. In a toilet, the water is flushed by a flushing mechanism. This flushing mechanism is usually activated by pushing a lever or pushing a button, and it causes water to be released from the tank into the bowl. The shape of the toilet bowl, as well as the type of flushing mechanism, determines how the water will move once it enters the bowl. When the toilet is flushed, the water quickly fills the bowl and then begins to swirl around. The force of the swirling water will cause it to push against the sides of the bowl and create a whirlpool effect. As the water circles around the bowl, the shape of the bowl determines the direction in which the water will spin. The water will usually spin in a clockwise direction in the northern hemisphere and in a counterclockwise direction in the southern hemisphere. The spin of the water in a toilet is determined by the shape of the toilet bowl and the type of flushing mechanism, not by the direction of the Earth's rotation. The shape of the bowl and the type of flush system will determine the direction in which the water will spin, regardless of which hemisphere the toilet is located in.
Under what circumstance? New toilet, when you turn the water on, water goes down the overflow tube to fill the bowl. You don't have to flush it the first time to fill the bowl.
NO.
You hold them or get clean water for them
On some toilets you DO get water from front of bowl, it's all a matter of design.
clay used in making the porcelain bowl or the trace minerals that are in the water in the toilet bow.