Function if97::tv

pub fn tv<R>(t: f64, v: f64, o_id_reg: R) -> f64where
    R: Into<o_id_region_args>,

tv(t,v,o_id) - the propertry of o_id(thermodynamic,transport,etc)
tv(t,v,(o_id,reg)) - the propertry of o_id in the region of reg(thermodynamic,transport,etc)

Examples

 use if97::*;

 let t:f64=300.0-273.15;
 let v:f64= 0.100215168e-2;
 let p=tv(t,v,OP);
 //set the regiion
 let s=tv(t,v,(OS,1));
 println!("t={p:.6} v={v:.6} p={p:.6} s={s:.6}");