Is cotton a synthetic material or a natural material? and why not

Which statement describes the appearance of a temperature-vs.-time graph? a horizontal line shows that the temperature increases at a constant rate over time. a vertical line shows that the temperature decreases at a constant rate over time. horizontal lines where the temperature is constant during phase changes connect upward-sloping lines where the temperature increases. horizontal lines where the temperature increases are connected by upward-sloping lines where the temperature is constant for each phase.

How air particles exert a pressure on the inside of the balloon

How many moles of gas are present if p=11 atm, v=12l, t=185k?