You can use the appropriate citation option from below to add a reference to this page.
"BTU." Fullformexpand.com, https://www.fullformexpand.com/btu/525409. Accessed 25 Nov. 2025.
Fullformexpand.com, 2025. "BTU." Accessed November 25, 2025. https://www.fullformexpand.com/btu/525409.
"BTU." (n.d.). Fullformexpand.com. Retrieved November 25, 2025, from https://www.fullformexpand.com/btu/525409.
BTU. (2025). Fullformexpand.com. Available at: https://www.fullformexpand.com/btu/525409 (Accessed: 25 November 2025).