If you were to pour liquid nitrogen onto a balloon filled with gaseous oxygen, several things would occur:
Cooling: Liquid nitrogen has an extremely low temperature of around -196 degrees Celsius (-321 degrees Fahrenheit), while oxygen is a gas at normal room temperature. When the liquid nitrogen comes into contact with the balloon filled with gaseous oxygen, it would rapidly absorb heat from the surrounding environment, including the oxygen gas inside the balloon. This would cause the oxygen to rapidly cool down.
Condensation: As the temperature of the oxygen gas decreases due to contact with the liquid nitrogen, it may reach its dew point, which is the temperature at which it starts to condense into a liquid. The oxygen gas may condense and form droplets inside the balloon.
Balloon Contraction: The rapid cooling of the oxygen gas inside the balloon would cause it to contract. As gases cool, their particles slow down and occupy less space, leading to a decrease in volume. The balloon would likely shrink or deflate as a result.
It's important to note that handling liquid nitrogen and oxygen requires proper precautions due to their extremely low temperatures and potential hazards. Direct contact with skin or eyes can cause severe frostbite or other injuries. Therefore, it is crucial to exercise caution and adhere to appropriate safety measures when working with these substances.