How many USDT are in 1 ETH?

Could you please explain to me, in detail, how the conversion rate of USDT to ETH is determined? I'm particularly interested in understanding how many USDT correspond to 1 ETH. Could you also elaborate on the factors that influence this conversion rate, such as market demand, supply, and any other relevant variables? Additionally, is there a standard or formula that is typically used for this conversion? I'm seeking clarity on this matter as I'm new to the cryptocurrency market and want to ensure I have a solid understanding of these conversions. Thank you for your assistance in this matter.