728x90 과학 (Science)11 NTP and STP 1. STP (Standard Temperature and Pressure) a. standard reference of temperature and pressure commonly used in chemistry and phyiscs b. Defined by IUPAC (International Union of Pure and Applied Chemistry) - Standard Temperature and pressure as air at $0^oC$ (273.15 K, 32$^oF$) and $10^5$ pascals (1bar)* * The old IUPAC standard was 101.325 kPa, which was changed in 1932. c. For ideal gas law - ST.. 2023. 3. 31. [저온물리 실험] Superinsulation (Multilayer insulation) Two major heat sources at ultra low temperature system: heat conduction and heat transfer from radiation. (1) Convective heat transfer: due to high vacuum condition (about $10^-4$ torr), convective heat transfer is almost eliminated (2) Heat conduction: In order to reduce conductive heat, low thermal conductivity materials are used (3) Radiated heat transfer: using superinsulation materials for .. 2022. 11. 11. 이전 1 2 다음 728x90
