7.5 G of copper oxide was reduced by heating of current of hydrogen and the weight of copper that remained was 6.35 gram in another experiment 19.05g of copper was dissolved in nitric acid and the resulting copper nitrate is converted into corporate oxide and the weight of copper oxide form was 23.35 gram show that these data are in accordance with the law of constant composition

7.5 G of copper oxide was reduced by heating of current of hydrogen and the weight of copper that remained was 6.35 gram in another experiment 19.05g of copper was dissolved in nitric acid and the resulting copper nitrate is converted into corporate oxide and the weight of copper oxide form was 23.35 gram show that these data are in accordance with the law of constant composition

if the temperature drops and becomes cool

then the atmosphere can be freezing as the water vapor in the air is at maximum (100%) and can be severely cold

also can be snowing lightly as the moisture in the air will start to solidify

and btw this is not chemistry but