What type of data was collected to prove to oxygen theory of combustion? list both qualitative and quantitative.

The Oxygen Theory of Combustion was proven through both qualitative and quantitative data.

Qualitative Data:

1. Observations: Scientists like Antoine Lavoisier observed that when substances burned, they often gained weight. This was contrary to the then-popular phlogiston theory, which suggested substances should lose weight when burned. This observation was a key piece of qualitative data.
2. Color Changes: During combustion, many substances change color. For example, when wood burns, it turns black. These color changes were another form of qualitative data used to support the oxygen theory of combustion.

Quantitative Data:

1. Weight Measurements: Lavoisier and others carefully measured the weight of substances before and after combustion. They found that the weight of the burned substance plus the weight of the oxygen consumed was equal to the weight of the original substance plus the weight of the air before combustion. This quantitative data was crucial in proving the oxygen theory of combustion.
2. Volume Measurements: Scientists also measured the volume of gas before and after combustion. They found that the volume of gas decreased after combustion, which supported the idea that oxygen was being consumed in the reaction. This was another important piece of quantitative data.