Jan Baptist Van Helmont Willow Tree Experiment

The three experiments that I will be discussing over is the Jan Baptist Van Helmont willow tree experiment that he did in sixteen thirty four. the Joseph Priestley mint in jar experiment that he went over in seventeen seventy four . The third experiment I will be discussing is the Jan Ingenhousz elodea and bubble experiment that he made in seventeen seventy four . All of these experiments are to find out more about photosynthesis. Jan Baptist Van Helmont performed the willow tree experiment in 1634. Jan Baptist Van Helmont had a hypothesis that he believed that if he added water to the soil, then the soil amount would decrease. He had a pot of earth soil that weighed two hundred pounds. He used a willow tree that weighed five pounds. Which would have been his independent variables for his experiment. The dependent variable or what Jan Baptist Van Helmont was measuring was how much the willow tree grew and also how much of the earth from the soil in the pot was still there. Which he finds out that only point two tenths were gone, not enough to show that it was soil making the tree grow. Which would mean the growth of the willow tree came from the water given to the tree. After he repeated the experiment he concluded that only water was needed to grow plants. Jan Baptist Van Helmont only had one flaw to his experiments and …show more content…
He thought that if you put a mint plant in a closed jar, then you can keep a candle lit. His independent variable was the amount of time he waited before relighting the candle. He measured if there was a flame or not, and if there is oxygen in the jar. Joseph Priestley made sure that in his experiment that he always kept the same was the same mint plant, same candle, and also when you relight the candle. He concluded that if you put a mint plant in a closed jar, then the candle will stay lit. He did not have any flaws in his experiment that would have made his results

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