The Occupational Safety and Health Administration has set a Permissible Exposure Limit of 1000 parts pe million (ppm) of acetone. You are an industrial hygienist doing personal sampling on a worker who is supervising a production process that uses acetone. The upcoming exposures can be measured: 700 ppm for three hours and 1300 ppm for two hours. 3 hours at 900 ppm What is the TWA as calculated? What advice would you provide plant management regarding acetone exposure and PEL adherence?

Q: U.S. energy use was approximately 100 quads (quadrillion But) in 2008. About 85% of this energy was…

A: Given Energy usage E=100quads =100×1015Btu  =1055×1017Jso energy supplid by fossil fuelsEff =0.85E…

Q: lodine (I2), like other substances, has only 3 phases: solid, liquid and gas. The triple point of…

A: Phase diagram is drawn showing the triple point. Correct answer: e) liquid cannot exist at 10 torr.

Q: a) During sliding of a cylindrical steel pin against a steel disc in a pin-on-disc test in air, the…

A: Given:-               Sliding of a cylindrical steel pin against a steel disc in a pin-on-disc test…

Q: For a copper-silver alloy of composition 9.7 wt% Ag-90.3 wt% Cu and at 775°C (1425°F) (see Animated…

A:

Q: Carbonitriding is a case-hardening process in which a steel is heated in a gaseous atmosphere of…

A: 1) true  2) true

Q: Which of the following measures of dispersion is independent of the units employed? (a) Coefficient…

A: coefficients of variation is unit free,

Q: 1. In a certain experiment the relationship for P is given as: P = 3Q²R+ QR. Q and R are…

A:

Q: 2. A fire truck is sucking water from a river and delivering it through a long hose to a nozzle. The…

A: There is no information provided on the flow. Therefore, we will assume that the flow is laminar…

Q: Steel sheets 400 mm wide by 2000 mm long by 2 mm thick are fabricated from SAE 4340 steel, which has…

A: Given data: Steel sheets dimensions: 400 mm wide by 2000 mm long by 2 mm thick Material: SAE 4340…

Q: Question 12 of 12 The zero order reaction A- Products takes 63.5 minutes for the oncentration of A…

A: Given data,  Zero Order Reaction t = 63.5 min No = 0.301 M ( No = Initial Concentration of A)  Nt =…

Q: In an experiment designed to determine the value of a parameter n, the actual value that is…

A: Detailed explanation and solution of the above problem uploaded in below picture.  By applying…

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.